src/main/tls.c

   1 /*
   2  * tls.c
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2001  hereUare Communications, Inc. <raghud@hereuare.com>
  21  * Copyright 2003  Alan DeKok <aland@freeradius.org>
  22  * Copyright 2006  The FreeRADIUS server project
  23  */
  24
  25 RCSID("$Id$")
  26 USES_APPLE_DEPRECATED_API       /* OpenSSL API has been deprecated by Apple */
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/process.h>
  30 #include <freeradius-devel/rad_assert.h>
  31
  32 #ifdef HAVE_SYS_STAT_H
  33 #include <sys/stat.h>
  34 #endif
  35
  36 #ifdef HAVE_FCNTL_H
  37 #include <fcntl.h>
  38 #endif
  39
  40 #ifdef HAVE_UTIME_H
  41 #include <utime.h>
  42 #endif
  43 #include <ctype.h>
  44
  45 #ifdef WITH_TLS
  46 #  ifdef HAVE_OPENSSL_RAND_H
  47 #    include <openssl/rand.h>
  48 #  endif
  49
  50 #  ifdef HAVE_OPENSSL_OCSP_H
  51 #    include <openssl/ocsp.h>
  52 #  endif
  53
  54 #  ifdef HAVE_OPENSSL_EVP_H
  55 #    include <openssl/evp.h>
  56 #  endif
  57 #  include <openssl/ssl.h>
  58
  59 #define LOG_PREFIX "tls"
  60
  61 #ifdef ENABLE_OPENSSL_VERSION_CHECK
  62 typedef struct libssl_defect {
  63         uint64_t        high;
  64         uint64_t        low;
  65
  66         char const      *id;
  67         char const      *name;
  68         char const      *comment;
  69 } libssl_defect_t;
  70
  71 /* Record critical defects in libssl here, new versions of OpenSSL to older versions of OpenSSL.  */
  72 static libssl_defect_t libssl_defects[] =
  73 {
  74         {
  75                 .low            = 0x01010101f,          /* 1.1.0a */
  76                 .high           = 0x01010101f,          /* 1.1.0a */
  77                 .id             = "CVE-2016-6309",
  78                 .name           = "OCSP status request extension",
  79                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160926.txt"
  80         },
  81         {
  82                 .low            = 0x01010100f,          /* 1.1.0  */
  83                 .high           = 0x01010100f,          /* 1.1.0  */
  84                 .id             = "CVE-2016-6304",
  85                 .name           = "OCSP status request extension",
  86                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
  87         },
  88         {
  89                 .low            = 0x01000209f,          /* 1.0.2i */
  90                 .high           = 0x01000209f,          /* 1.0.2i */
  91                 .id             = "CVE-2016-7052",
  92                 .name           = "OCSP status request extension",
  93                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160926.txt"
  94         },
  95         {
  96                 .low            = 0x01000200f,          /* 1.0.2  */
  97                 .high           = 0x01000208f,          /* 1.0.2h */
  98                 .id             = "CVE-2016-6304",
  99                 .name           = "OCSP status request extension",
 100                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
 101         },
 102         {
 103                 .low            = 0x01000100f,          /* 1.0.1  */
 104                 .high           = 0x01000114f,          /* 1.0.1t */
 105                 .id             = "CVE-2016-6304",
 106                 .name           = "OCSP status request extension",
 107                 .comment        = "For more information see https://www.openssl.org/news/secadv/20160922.txt"
 108         },
 109         {
 110                 .low            = 0x010001000,          /* 1.0.1  */
 111                 .high           = 0x01000106f,          /* 1.0.1f */
 112                 .id             = "CVE-2014-0160",
 113                 .name           = "Heartbleed",
 114                 .comment        = "For more information see http://heartbleed.com"
 115         },
 116 };
 117 #endif /* ENABLE_OPENSSL_VERSION_CHECK */
 118
 119 FR_NAME_NUMBER const fr_tls_status_table[] = {
 120         { "invalid",                    FR_TLS_INVALID },
 121         { "request",                    FR_TLS_REQUEST },
 122         { "response",                   FR_TLS_RESPONSE },
 123         { "success",                    FR_TLS_SUCCESS },
 124         { "fail",                       FR_TLS_FAIL },
 125         { "noop",                       FR_TLS_NOOP },
 126
 127         { "start",                      FR_TLS_START },
 128         { "ok",                         FR_TLS_OK },
 129         { "ack",                        FR_TLS_ACK },
 130         { "first fragment",             FR_TLS_FIRST_FRAGMENT },
 131         { "more fragments",             FR_TLS_MORE_FRAGMENTS },
 132         { "length included",            FR_TLS_LENGTH_INCLUDED },
 133         { "more fragments with length", FR_TLS_MORE_FRAGMENTS_WITH_LENGTH },
 134         { "handled",                    FR_TLS_HANDLED },
 135         {  NULL ,                       -1},
 136 };
 137
 138 /* index we use to store cached session VPs
 139  * needs to be dynamic so we can supply a "free" function
 140  */
 141 int fr_tls_ex_index_vps = -1;
 142 int fr_tls_ex_index_certs = -1;
 143
 144 /* Session */
 145 static void             session_close(tls_session_t *ssn);
 146 static void             session_init(tls_session_t *ssn);
 147
 148 /* record */
 149 static void             record_init(record_t *buf);
 150 static void             record_close(record_t *buf);
 151 static unsigned int     record_plus(record_t *buf, void const *ptr,
 152                                     unsigned int size);
 153 static unsigned int     record_minus(record_t *buf, void *ptr,
 154                                      unsigned int size);
 155
 156 DIAG_OFF(format-nonliteral)
 157 /** Print errors in the TLS thread local error stack
 158  *
 159  * Drains the thread local OpenSSL error queue, and prints out errors.
 160  *
 161  * @param[in] request   The current request (may be NULL).
 162  * @param[in] msg       Error message describing the operation being attempted.
 163  * @param[in] ap        Arguments for msg.
 164  * @return the number of errors drained from the stack.
 165  */
 166 static int tls_verror_log(REQUEST *request, char const *msg, va_list ap)
 167 {
 168         unsigned long   error;
 169         char            *p;
 170         int             in_stack = 0;
 171         char            buffer[256];
 172
 173         int             line;
 174         char const      *file;
 175
 176         /*
 177          *      Pop the first error, so ERR_peek_error()
 178          *      can be used to determine if there are
 179          *      multiple errors.
 180          */
 181         error = ERR_get_error_line(&file, &line);
 182
 183         if (msg) {
 184                 p = talloc_vasprintf(request, msg, ap);
 185
 186                 /*
 187                  *      Single line mode (there's only one error)
 188                  */
 189                 if (error && !ERR_peek_error()) {
 190                         ERR_error_string_n(error, buffer, sizeof(buffer));
 191
 192                         /* Extra verbose */
 193                         if ((request && RDEBUG_ENABLED3) || DEBUG_ENABLED3) {
 194                                 ROPTIONAL(REDEBUG, ERROR, "%s: %s[%i]:%s", p, file, line, buffer);
 195                         } else {
 196                                 ROPTIONAL(REDEBUG, ERROR, "%s: %s", p, buffer);
 197                         }
 198
 199                         talloc_free(p);
 200
 201                         return 1;
 202                 }
 203
 204                 /*
 205                  *      Print the error we were given, irrespective
 206                  *      of whether there were any OpenSSL errors.
 207                  */
 208                 ROPTIONAL(RERROR, ERROR, "%s", p);
 209                 talloc_free(p);
 210         }
 211
 212         /*
 213          *      Stack mode (there are multiple errors)
 214          */
 215         if (!error) return 0;
 216         do {
 217                 ERR_error_string_n(error, buffer, sizeof(buffer));
 218                 /* Extra verbose */
 219                 if ((request && RDEBUG_ENABLED3) || DEBUG_ENABLED3) {
 220                         ROPTIONAL(REDEBUG, ERROR, "%s[%i]:%s", file, line, buffer);
 221                 } else {
 222                         ROPTIONAL(REDEBUG, ERROR, "%s", buffer);
 223                 }
 224                 in_stack++;
 225         } while ((error = ERR_get_error_line(&file, &line)));
 226
 227         return in_stack;
 228 }
 229 DIAG_ON(format-nonliteral)
 230
 231 /** Print errors in the TLS thread local error stack
 232  *
 233  * Drains the thread local OpenSSL error queue, and prints out errors.
 234  *
 235  * @param[in] request   The current request (may be NULL).
 236  * @param[in] msg       Error message describing the operation being attempted.
 237  * @param[in] ...       Arguments for msg.
 238  * @return the number of errors drained from the stack.
 239  */
 240 int tls_error_log(REQUEST *request, char const *msg, ...)
 241 {
 242         va_list ap;
 243         int ret;
 244
 245         va_start(ap, msg);
 246         ret = tls_verror_log(request, msg, ap);
 247         va_end(ap);
 248
 249         return ret;
 250 }
 251
 252 /** Print errors raised by OpenSSL I/O functions
 253  *
 254  * Drains the thread local OpenSSL error queue, and prints out errors
 255  * based on the SSL handle and the return code of the I/O  function.
 256  *
 257  * OpenSSL lists I/O functions to be:
 258  *   - SSL_connect
 259  *   - SSL_accept
 260  *   - SSL_do_handshake
 261  *   - SSL_read
 262  *   - SSL_peek
 263  *   - SSL_write
 264  *
 265  * @param request       The current request (may be NULL).
 266  * @param session       The current tls_session.
 267  * @param ret           from the I/O operation.
 268  * @param msg           Error message describing the operation being attempted.
 269  * @param ...           Arguments for msg.
 270  * @return
 271  *      - 0 TLS session cannot continue.
 272  *      - 1 TLS session may still be viable.
 273  */
 274 int tls_error_io_log(REQUEST *request, tls_session_t *session, int ret, char const *msg, ...)
 275 {
 276         int     error;
 277         va_list ap;
 278
 279         if (ERR_peek_error()) {
 280                 va_start(ap, msg);
 281                 tls_verror_log(request, msg, ap);
 282                 va_end(ap);
 283         }
 284
 285         error = SSL_get_error(session->ssl, ret);
 286         switch (error) {
 287         /*
 288          *      These seem to be harmless and already "dealt
 289          *      with" by our non-blocking environment. NB:
 290          *      "ZERO_RETURN" is the clean "error"
 291          *      indicating a successfully closed SSL
 292          *      tunnel. We let this happen because our IO
 293          *      loop should not appear to have broken on
 294          *      this condition - and outside the IO loop, the
 295          *      "shutdown" state is checked.
 296          *
 297          *      Don't print anything if we ignore the error.
 298          */
 299         case SSL_ERROR_NONE:
 300         case SSL_ERROR_WANT_READ:
 301         case SSL_ERROR_WANT_WRITE:
 302         case SSL_ERROR_WANT_X509_LOOKUP:
 303         case SSL_ERROR_ZERO_RETURN:
 304                 break;
 305
 306         /*
 307          *      These seem to be indications of a genuine
 308          *      error that should result in the SSL tunnel
 309          *      being regarded as "dead".
 310          */
 311         case SSL_ERROR_SYSCALL:
 312                 ROPTIONAL(REDEBUG, ERROR, "System call (I/O) error (%i)", ret);
 313                 return 0;
 314
 315         case SSL_ERROR_SSL:
 316                 ROPTIONAL(REDEBUG, ERROR, "TLS protocol error (%i)", ret);
 317                 return 0;
 318
 319         /*
 320          *      For any other errors that (a) exist, and (b)
 321          *      crop up - we need to interpret what to do with
 322          *      them - so "politely inform" the caller that
 323          *      the code needs updating here.
 324          */
 325         default:
 326                 ROPTIONAL(REDEBUG, ERROR, "TLS session error %i (%i)", error, ret);
 327                 return 0;
 328         }
 329
 330         return 1;
 331 }
 332
 333 #ifdef PSK_MAX_IDENTITY_LEN
 334 static bool identity_is_safe(const char *identity)
 335 {
 336         char c;
 337
 338         if (!identity) return true;
 339
 340         while ((c = *(identity++)) != '\0') {
 341                 if (isalpha((int) c) || isdigit((int) c) || isspace((int) c) ||
 342                     (c == '@') || (c == '-') || (c == '_') || (c == '.')) {
 343                         continue;
 344                 }
 345
 346                 return false;
 347         }
 348
 349         return true;
 350 }
 351
 352 /*
 353  *      When a client uses TLS-PSK to talk to a server, this callback
 354  *      is used by the server to determine the PSK to use.
 355  */
 356 static unsigned int psk_server_callback(SSL *ssl, const char *identity,
 357                                         unsigned char *psk,
 358                                         unsigned int max_psk_len)
 359 {
 360         unsigned int psk_len = 0;
 361         fr_tls_server_conf_t *conf;
 362         REQUEST *request;
 363
 364         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 365                                                        FR_TLS_EX_INDEX_CONF);
 366         if (!conf) return 0;
 367
 368         request = (REQUEST *)SSL_get_ex_data(ssl,
 369                                              FR_TLS_EX_INDEX_REQUEST);
 370         if (request && conf->psk_query) {
 371                 size_t hex_len;
 372                 VALUE_PAIR *vp;
 373                 char buffer[2 * PSK_MAX_PSK_LEN + 4]; /* allow for too-long keys */
 374
 375                 /*
 376                  *      The passed identity is weird.  Deny it.
 377                  */
 378                 if (!identity_is_safe(identity)) {
 379                         RWDEBUG("Invalid characters in PSK identity %s", identity);
 380                         return 0;
 381                 }
 382
 383                 vp = pair_make_request("TLS-PSK-Identity", identity, T_OP_SET);
 384                 if (!vp) return 0;
 385
 386                 hex_len = radius_xlat(buffer, sizeof(buffer), request, conf->psk_query,
 387                                       NULL, NULL);
 388                 if (!hex_len) {
 389                         RWDEBUG("PSK expansion returned an empty string.");
 390                         return 0;
 391                 }
 392
 393                 /*
 394                  *      The returned key is truncated at MORE than
 395                  *      OpenSSL can handle.  That way we can detect
 396                  *      the truncation, and complain about it.
 397                  */
 398                 if (hex_len > (2 * max_psk_len)) {
 399                         RWDEBUG("Returned PSK is too long (%u > %u)",
 400                                 (unsigned int) hex_len, 2 * max_psk_len);
 401                         return 0;
 402                 }
 403
 404                 /*
 405                  *      Leave the TLS-PSK-Identity in the request, and
 406                  *      convert the expansion from printable string
 407                  *      back to hex.
 408                  */
 409                 return fr_hex2bin(psk, max_psk_len, buffer, hex_len);
 410         }
 411
 412         if (!conf->psk_identity) {
 413                 DEBUG("No static PSK identity set.  Rejecting the user");
 414                 return 0;
 415         }
 416
 417         /*
 418          *      No REQUEST, or no dynamic query.  Just look for a
 419          *      static identity.
 420          */
 421         if (strcmp(identity, conf->psk_identity) != 0) {
 422                 ERROR("Supplied PSK identity %s does not match configuration.  Rejecting.",
 423                       identity);
 424                 return 0;
 425         }
 426
 427         psk_len = strlen(conf->psk_password);
 428         if (psk_len > (2 * max_psk_len)) return 0;
 429
 430         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 431 }
 432
 433 static unsigned int psk_client_callback(SSL *ssl, UNUSED char const *hint,
 434                                         char *identity, unsigned int max_identity_len,
 435                                         unsigned char *psk, unsigned int max_psk_len)
 436 {
 437         unsigned int psk_len;
 438         fr_tls_server_conf_t *conf;
 439
 440         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl,
 441                                                        FR_TLS_EX_INDEX_CONF);
 442         if (!conf) return 0;
 443
 444         psk_len = strlen(conf->psk_password);
 445         if (psk_len > (2 * max_psk_len)) return 0;
 446
 447         strlcpy(identity, conf->psk_identity, max_identity_len);
 448
 449         return fr_hex2bin(psk, max_psk_len, conf->psk_password, psk_len);
 450 }
 451
 452 #endif
 453
 454 #define MAX_SESSION_SIZE (256)
 455
 456
 457 void tls_session_id(SSL_SESSION *ssn, char *buffer, size_t bufsize)
 458 {
 459 #if OPENSSL_VERSION_NUMBER < 0x10001000L
 460         size_t size;
 461
 462         size = ssn->session_id_length;
 463         if (size > bufsize) size = bufsize;
 464
 465         fr_bin2hex(buffer, ssn->session_id, size);
 466 #else
 467         unsigned int size;
 468         uint8_t const *p;
 469
 470         p = SSL_SESSION_get_id(ssn, &size);
 471         if (size > bufsize) size = bufsize;
 472
 473         fr_bin2hex(buffer, p, size);
 474
 475 #endif
 476 }
 477
 478
 479
 480 static int _tls_session_free(tls_session_t *ssn)
 481 {
 482         /*
 483          *      Free any opaque TTLS or PEAP data.
 484          */
 485         if ((ssn->opaque) && (ssn->free_opaque)) {
 486                 ssn->free_opaque(ssn->opaque);
 487                 ssn->opaque = NULL;
 488         }
 489
 490         session_close(ssn);
 491
 492         return 0;
 493 }
 494
 495 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd)
 496 {
 497         int ret;
 498         int verify_mode;
 499         tls_session_t *ssn = NULL;
 500         REQUEST *request;
 501
 502         ssn = talloc_zero(ctx, tls_session_t);
 503         if (!ssn) return NULL;
 504
 505         talloc_set_destructor(ssn, _tls_session_free);
 506
 507         ssn->ctx = conf->ctx;
 508         ssn->mtu = conf->fragment_size;
 509
 510         SSL_CTX_set_mode(ssn->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
 511
 512         ssn->ssl = SSL_new(ssn->ctx);
 513         if (!ssn->ssl) {
 514                 talloc_free(ssn);
 515                 return NULL;
 516         }
 517
 518         request = request_alloc(ssn);
 519         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_REQUEST, (void *)request);
 520
 521         /*
 522          *      Add the message callback to identify what type of
 523          *      message/handshake is passed
 524          */
 525         SSL_set_msg_callback(ssn->ssl, cbtls_msg);
 526         SSL_set_msg_callback_arg(ssn->ssl, ssn);
 527         SSL_set_info_callback(ssn->ssl, cbtls_info);
 528
 529         /*
 530          *      Always verify the peer certificate.
 531          */
 532         DEBUG2("Requiring Server certificate");
 533         verify_mode = SSL_VERIFY_PEER;
 534         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 535         SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
 536
 537         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 538         SSL_set_ex_data(ssn->ssl, FR_TLS_EX_INDEX_SSN, (void *)ssn);
 539         SSL_set_fd(ssn->ssl, fd);
 540         ret = SSL_connect(ssn->ssl);
 541
 542         if (ret < 0) {
 543                 switch (SSL_get_error(ssn->ssl, ret)) {
 544                         default:
 545                                 break;
 546
 547
 548
 549                 case SSL_ERROR_WANT_READ:
 550                 case SSL_ERROR_WANT_WRITE:
 551                         ssn->connected = false;
 552                         return ssn;
 553                 }
 554         }
 555
 556         if (ret <= 0) {
 557                 tls_error_io_log(NULL, ssn, ret, "Failed in " STRINGIFY(__FUNCTION__) " (SSL_connect)");
 558                 talloc_free(ssn);
 559
 560                 return NULL;
 561         }
 562
 563         ssn->connected = true;
 564         return ssn;
 565 }
 566
 567 /** Create a new TLS session
 568  *
 569  * Configures a new TLS session, configuring options, setting callbacks etc...
 570  *
 571  * @param ctx to alloc session data in. Should usually be NULL unless the lifetime of the
 572  *      session is tied to another talloc'd object.
 573  * @param conf to use to configure the tls session.
 574  * @param request The current #REQUEST.
 575  * @param client_cert Whether to require a client_cert.
 576  * @return a new session on success, or NULL on error.
 577  */
 578 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert)
 579 {
 580         tls_session_t   *state = NULL;
 581         SSL             *new_tls = NULL;
 582         int             verify_mode = 0;
 583         VALUE_PAIR      *vp;
 584
 585         rad_assert(request != NULL);
 586
 587         RDEBUG2("Initiating new EAP-TLS session");
 588
 589         /*
 590          *      Manually flush the sessions every so often.  If HALF
 591          *      of the session lifetime has passed since we last
 592          *      flushed, then flush it again.
 593          *
 594          *      FIXME: Also do it every N sessions?
 595          */
 596         if (conf->session_cache_enable &&
 597             ((conf->session_last_flushed + ((int)conf->session_timeout * 1800)) <= request->timestamp)){
 598                 RDEBUG2("Flushing SSL sessions (of #%ld)", SSL_CTX_sess_number(conf->ctx));
 599
 600                 SSL_CTX_flush_sessions(conf->ctx, request->timestamp);
 601                 conf->session_last_flushed = request->timestamp;
 602         }
 603
 604         new_tls = SSL_new(conf->ctx);
 605         if (new_tls == NULL) {
 606                 tls_error_log(request, "Error creating new TLS session");
 607                 return NULL;
 608         }
 609
 610         /* We use the SSL's "app_data" to indicate a call-back */
 611         SSL_set_app_data(new_tls, NULL);
 612
 613         if ((state = talloc_zero(ctx, tls_session_t)) == NULL) {
 614                 RERROR("Error allocating memory for SSL state");
 615                 return NULL;
 616         }
 617         session_init(state);
 618         talloc_set_destructor(state, _tls_session_free);
 619
 620         state->ctx = conf->ctx;
 621         state->ssl = new_tls;
 622
 623         /*
 624          *      Initialize callbacks
 625          */
 626         state->record_init = record_init;
 627         state->record_close = record_close;
 628         state->record_plus = record_plus;
 629         state->record_minus = record_minus;
 630
 631         /*
 632          *      Create & hook the BIOs to handle the dirty side of the
 633          *      SSL.  This is *very important* as we want to handle
 634          *      the transmission part.  Now the only IO interface
 635          *      that SSL is aware of, is our defined BIO buffers.
 636          *
 637          *      This means that all SSL IO is done to/from memory,
 638          *      and we can update those BIOs from the packets we've
 639          *      received.
 640          */
 641         state->into_ssl = BIO_new(BIO_s_mem());
 642         state->from_ssl = BIO_new(BIO_s_mem());
 643         SSL_set_bio(state->ssl, state->into_ssl, state->from_ssl);
 644
 645         /*
 646          *      Add the message callback to identify what type of
 647          *      message/handshake is passed
 648          */
 649         SSL_set_msg_callback(new_tls, cbtls_msg);
 650         SSL_set_msg_callback_arg(new_tls, state);
 651         SSL_set_info_callback(new_tls, cbtls_info);
 652
 653         /*
 654          *      In Server mode we only accept.
 655          */
 656         SSL_set_accept_state(state->ssl);
 657
 658         /*
 659          *      Verify the peer certificate, if asked.
 660          */
 661         if (client_cert) {
 662                 RDEBUG2("Setting verify mode to require certificate from client");
 663                 verify_mode = SSL_VERIFY_PEER;
 664                 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
 665                 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
 666         }
 667         SSL_set_verify(state->ssl, verify_mode, cbtls_verify);
 668
 669         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_CONF, (void *)conf);
 670         SSL_set_ex_data(state->ssl, FR_TLS_EX_INDEX_SSN, (void *)state);
 671         state->length_flag = conf->include_length;
 672
 673         /*
 674          *      We use default fragment size, unless the Framed-MTU
 675          *      tells us it's too big.  Note that we do NOT account
 676          *      for the EAP-TLS headers if conf->fragment_size is
 677          *      large, because that config item looks to be confusing.
 678          *
 679          *      i.e. it should REALLY be called MTU, and the code here
 680          *      should figure out what that means for TLS fragment size.
 681          *      asking the administrator to know the internal details
 682          *      of EAP-TLS in order to calculate fragment sizes is
 683          *      just too much.
 684          */
 685         state->mtu = conf->fragment_size;
 686         vp = fr_pair_find_by_num(request->packet->vps, PW_FRAMED_MTU, 0, TAG_ANY);
 687         if (vp && (vp->vp_integer > 100) && (vp->vp_integer < state->mtu)) {
 688                 state->mtu = vp->vp_integer;
 689         }
 690
 691         if (conf->session_cache_enable) state->allow_session_resumption = true; /* otherwise it's false */
 692
 693         return state;
 694 }
 695
 696 /*
 697  * We are the server, we always get the dirty data
 698  * (Handshake data is also considered as dirty data)
 699  * During handshake, since SSL API handles itself,
 700  * After clean-up, dirty_out will be filled with
 701  * the data required for handshaking. So we check
 702  * if dirty_out is empty then we simply send it back.
 703  * As of now, if handshake is successful, then we keep going,
 704  * otherwise we fail.
 705  *
 706  * Fill the Bio with the dirty data to clean it
 707  * Get the cleaned data from SSL, if it is not Handshake data
 708  */
 709 int tls_handshake_recv(REQUEST *request, tls_session_t *ssn)
 710 {
 711         int err;
 712
 713         if (ssn->invalid_hb_used) return 0;
 714
 715         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data, ssn->dirty_in.used);
 716         if (err != (int) ssn->dirty_in.used) {
 717                 REDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
 718                 record_init(&ssn->dirty_in);
 719                 return 0;
 720         }
 721         record_init(&ssn->dirty_in);
 722
 723         err = SSL_read(ssn->ssl, ssn->clean_out.data + ssn->clean_out.used,
 724                        sizeof(ssn->clean_out.data) - ssn->clean_out.used);
 725         if (err > 0) {
 726                 ssn->clean_out.used += err;
 727                 return 1;
 728         }
 729
 730         if (!tls_error_io_log(request, ssn, err, "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)")) return 0;
 731
 732         /* Some Extra STATE information for easy debugging */
 733         if (SSL_is_init_finished(ssn->ssl)) RDEBUG2("SSL Connection Established");
 734         if (SSL_in_init(ssn->ssl)) RDEBUG2("In SSL Handshake Phase");
 735         if (SSL_in_before(ssn->ssl)) RDEBUG2("Before SSL Handshake Phase");
 736         if (SSL_in_accept_init(ssn->ssl)) RDEBUG2("In SSL Accept mode");
 737         if (SSL_in_connect_init(ssn->ssl)) RDEBUG2("In SSL Connect mode");
 738
 739 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
 740         /*
 741          *      Cache the SSL_SESSION pointer.
 742          */
 743         if (!ssn->ssl_session && SSL_is_init_finished(ssn->ssl)) {
 744                 ssn->ssl_session = SSL_get_session(ssn->ssl);
 745                 if (!ssn->ssl_session) {
 746                         RDEBUG("Failed getting SSL session");
 747                         return 0;
 748                 }
 749         }
 750 #endif
 751
 752         err = BIO_ctrl_pending(ssn->from_ssl);
 753         if (err > 0) {
 754                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 755                                sizeof(ssn->dirty_out.data));
 756                 if (err > 0) {
 757                         ssn->dirty_out.used = err;
 758
 759                 } else if (BIO_should_retry(ssn->from_ssl)) {
 760                         record_init(&ssn->dirty_in);
 761                         RDEBUG2("Asking for more data in tunnel");
 762                         return 1;
 763
 764                 } else {
 765                         tls_error_log(NULL, NULL);
 766                         record_init(&ssn->dirty_in);
 767                         return 0;
 768                 }
 769         } else {
 770                 RDEBUG2("SSL Application Data");
 771                 /* Its clean application data, do whatever we want */
 772                 record_init(&ssn->clean_out);
 773         }
 774
 775         /* We are done with dirty_in, reinitialize it */
 776         record_init(&ssn->dirty_in);
 777         return 1;
 778 }
 779
 780 /*
 781  *      Take cleartext user data, and encrypt it into the output buffer,
 782  *      to send to the client at the other end of the SSL connection.
 783  */
 784 int tls_handshake_send(REQUEST *request, tls_session_t *ssn)
 785 {
 786         int err;
 787
 788         /*
 789          *      If there's un-encrypted data in 'clean_in', then write
 790          *      that data to the SSL session, and then call the BIO function
 791          *      to get that encrypted data from the SSL session, into
 792          *      a buffer which we can then package into an EAP packet.
 793          *
 794          *      Based on Server's logic this clean_in is expected to
 795          *      contain the data to send to the client.
 796          */
 797         if (ssn->clean_in.used > 0) {
 798                 int written;
 799
 800                 written = SSL_write(ssn->ssl, ssn->clean_in.data, ssn->clean_in.used);
 801                 record_minus(&ssn->clean_in, NULL, written);
 802
 803                 /* Get the dirty data from Bio to send it */
 804                 err = BIO_read(ssn->from_ssl, ssn->dirty_out.data,
 805                                sizeof(ssn->dirty_out.data));
 806                 if (err > 0) {
 807                         ssn->dirty_out.used = err;
 808                 } else {
 809                         if (!tls_error_io_log(request, ssn, err,
 810                                               "Failed in " STRINGIFY(__FUNCTION__) " (SSL_write)")) {
 811                                 return 0;
 812                         }
 813                 }
 814         }
 815
 816         return 1;
 817 }
 818
 819 static void session_init(tls_session_t *ssn)
 820 {
 821         ssn->ssl = NULL;
 822         ssn->into_ssl = ssn->from_ssl = NULL;
 823         record_init(&ssn->clean_in);
 824         record_init(&ssn->clean_out);
 825         record_init(&ssn->dirty_in);
 826         record_init(&ssn->dirty_out);
 827
 828         memset(&ssn->info, 0, sizeof(ssn->info));
 829
 830         ssn->mtu = 0;
 831         ssn->fragment = false;
 832         ssn->tls_msg_len = 0;
 833         ssn->length_flag = false;
 834         ssn->opaque = NULL;
 835         ssn->free_opaque = NULL;
 836 }
 837
 838 static void session_close(tls_session_t *ssn)
 839 {
 840         if (ssn->ssl) {
 841                 SSL_set_quiet_shutdown(ssn->ssl, 1);
 842                 SSL_shutdown(ssn->ssl);
 843
 844                 SSL_free(ssn->ssl);
 845                 ssn->ssl = NULL;
 846         }
 847
 848         record_close(&ssn->clean_in);
 849         record_close(&ssn->clean_out);
 850         record_close(&ssn->dirty_in);
 851         record_close(&ssn->dirty_out);
 852         session_init(ssn);
 853 }
 854
 855 static void record_init(record_t *rec)
 856 {
 857         rec->used = 0;
 858 }
 859
 860 static void record_close(record_t *rec)
 861 {
 862         rec->used = 0;
 863 }
 864
 865
 866 /*
 867  *      Copy data to the intermediate buffer, before we send
 868  *      it somewhere.
 869  */
 870 static unsigned int record_plus(record_t *rec, void const *ptr,
 871                                 unsigned int size)
 872 {
 873         unsigned int added = MAX_RECORD_SIZE - rec->used;
 874
 875         if(added > size)
 876                 added = size;
 877         if(added == 0)
 878                 return 0;
 879         memcpy(rec->data + rec->used, ptr, added);
 880         rec->used += added;
 881         return added;
 882 }
 883
 884 /*
 885  *      Take data from the buffer, and give it to the caller.
 886  */
 887 static unsigned int record_minus(record_t *rec, void *ptr,
 888                                  unsigned int size)
 889 {
 890         unsigned int taken = rec->used;
 891
 892         if(taken > size)
 893                 taken = size;
 894         if(taken == 0)
 895                 return 0;
 896         if(ptr)
 897                 memcpy(ptr, rec->data, taken);
 898         rec->used -= taken;
 899
 900         /*
 901          *      This is pretty bad...
 902          */
 903         if (rec->used > 0) memmove(rec->data, rec->data + taken, rec->used);
 904
 905         return taken;
 906 }
 907
 908 void tls_session_information(tls_session_t *tls_session)
 909 {
 910         char const *str_write_p, *str_version, *str_content_type = "";
 911         char const *str_details1 = "", *str_details2= "";
 912         REQUEST *request;
 913         char buffer[32];
 914
 915         /*
 916          *      Don't print this out in the normal course of
 917          *      operations.
 918          */
 919         if (rad_debug_lvl == 0) return;
 920
 921         str_write_p = tls_session->info.origin ? ">>> send" : "<<< recv";
 922
 923         switch (tls_session->info.version) {
 924         case SSL2_VERSION:
 925                 str_version = "SSL 2.0 ";
 926                 break;
 927         case SSL3_VERSION:
 928                 str_version = "SSL 3.0 ";
 929                 break;
 930         case TLS1_VERSION:
 931                 str_version = "TLS 1.0 ";
 932                 break;
 933 #ifdef TLS1_1_VERSION
 934         case TLS1_1_VERSION:
 935                 str_version = "TLS 1.1 ";
 936                 break;
 937 #endif
 938 #ifdef TLS1_2_VERSION
 939         case TLS1_2_VERSION:
 940                 str_version = "TLS 1.2 ";
 941                 break;
 942 #endif
 943 #ifdef TLS1_3_VERSON
 944         case TLS1_3_VERSION:
 945                 str_version = "TLS 1.3 ";
 946                 break;
 947 #endif
 948
 949         default:
 950                 sprintf(buffer, "UNKNOWN TLS VERSION ?%04X?", tls_session->info.version);
 951                 str_version = buffer;
 952                 break;
 953         }
 954
 955         if (tls_session->info.version == SSL3_VERSION ||
 956             tls_session->info.version == TLS1_VERSION) {
 957                 switch (tls_session->info.content_type) {
 958                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 959                         str_content_type = "ChangeCipherSpec";
 960                         break;
 961
 962                 case SSL3_RT_ALERT:
 963                         str_content_type = "Alert";
 964                         break;
 965
 966                 case SSL3_RT_HANDSHAKE:
 967                         str_content_type = "Handshake";
 968                         break;
 969
 970                 case SSL3_RT_APPLICATION_DATA:
 971                         str_content_type = "ApplicationData";
 972                         break;
 973
 974                 default:
 975                         str_content_type = "UnknownContentType";
 976                         break;
 977                 }
 978
 979                 if (tls_session->info.content_type == SSL3_RT_ALERT) {
 980                         str_details1 = ", ???";
 981
 982                         if (tls_session->info.record_len == 2) {
 983
 984                                 switch (tls_session->info.alert_level) {
 985                                 case SSL3_AL_WARNING:
 986                                         str_details1 = ", warning";
 987                                         break;
 988                                 case SSL3_AL_FATAL:
 989                                         str_details1 = ", fatal";
 990                                         break;
 991                                 }
 992
 993                                 str_details2 = " ???";
 994                                 switch (tls_session->info.alert_description) {
 995                                 case SSL3_AD_CLOSE_NOTIFY:
 996                                         str_details2 = " close_notify";
 997                                         break;
 998
 999                                 case SSL3_AD_UNEXPECTED_MESSAGE:
1000                                         str_details2 = " unexpected_message";
1001                                         break;
1002
1003                                 case SSL3_AD_BAD_RECORD_MAC:
1004                                         str_details2 = " bad_record_mac";
1005                                         break;
1006
1007                                 case TLS1_AD_DECRYPTION_FAILED:
1008                                         str_details2 = " decryption_failed";
1009                                         break;
1010
1011                                 case TLS1_AD_RECORD_OVERFLOW:
1012                                         str_details2 = " record_overflow";
1013                                         break;
1014
1015                                 case SSL3_AD_DECOMPRESSION_FAILURE:
1016                                         str_details2 = " decompression_failure";
1017                                         break;
1018
1019                                 case SSL3_AD_HANDSHAKE_FAILURE:
1020                                         str_details2 = " handshake_failure";
1021                                         break;
1022
1023                                 case SSL3_AD_BAD_CERTIFICATE:
1024                                         str_details2 = " bad_certificate";
1025                                         break;
1026
1027                                 case SSL3_AD_UNSUPPORTED_CERTIFICATE:
1028                                         str_details2 = " unsupported_certificate";
1029                                         break;
1030
1031                                 case SSL3_AD_CERTIFICATE_REVOKED:
1032                                         str_details2 = " certificate_revoked";
1033                                         break;
1034
1035                                 case SSL3_AD_CERTIFICATE_EXPIRED:
1036                                         str_details2 = " certificate_expired";
1037                                         break;
1038
1039                                 case SSL3_AD_CERTIFICATE_UNKNOWN:
1040                                         str_details2 = " certificate_unknown";
1041                                         break;
1042
1043                                 case SSL3_AD_ILLEGAL_PARAMETER:
1044                                         str_details2 = " illegal_parameter";
1045                                         break;
1046
1047                                 case TLS1_AD_UNKNOWN_CA:
1048                                         str_details2 = " unknown_ca";
1049                                         break;
1050
1051                                 case TLS1_AD_ACCESS_DENIED:
1052                                         str_details2 = " access_denied";
1053                                         break;
1054
1055                                 case TLS1_AD_DECODE_ERROR:
1056                                         str_details2 = " decode_error";
1057                                         break;
1058
1059                                 case TLS1_AD_DECRYPT_ERROR:
1060                                         str_details2 = " decrypt_error";
1061                                         break;
1062
1063                                 case TLS1_AD_EXPORT_RESTRICTION:
1064                                         str_details2 = " export_restriction";
1065                                         break;
1066
1067                                 case TLS1_AD_PROTOCOL_VERSION:
1068                                         str_details2 = " protocol_version";
1069                                         break;
1070
1071                                 case TLS1_AD_INSUFFICIENT_SECURITY:
1072                                         str_details2 = " insufficient_security";
1073                                         break;
1074
1075                                 case TLS1_AD_INTERNAL_ERROR:
1076                                         str_details2 = " internal_error";
1077                                         break;
1078
1079                                 case TLS1_AD_USER_CANCELLED:
1080                                         str_details2 = " user_canceled";
1081                                         break;
1082
1083                                 case TLS1_AD_NO_RENEGOTIATION:
1084                                         str_details2 = " no_renegotiation";
1085                                         break;
1086                                 }
1087                         }
1088                 }
1089
1090                 if (tls_session->info.content_type == SSL3_RT_HANDSHAKE) {
1091                         str_details1 = "???";
1092
1093                         if (tls_session->info.record_len > 0) switch (tls_session->info.handshake_type) {
1094                         case SSL3_MT_HELLO_REQUEST:
1095                                 str_details1 = ", HelloRequest";
1096                                 break;
1097
1098                         case SSL3_MT_CLIENT_HELLO:
1099                                 str_details1 = ", ClientHello";
1100                                 break;
1101
1102                         case SSL3_MT_SERVER_HELLO:
1103                                 str_details1 = ", ServerHello";
1104                                 break;
1105
1106                         case SSL3_MT_CERTIFICATE:
1107                                 str_details1 = ", Certificate";
1108                                 break;
1109
1110                         case SSL3_MT_SERVER_KEY_EXCHANGE:
1111                                 str_details1 = ", ServerKeyExchange";
1112                                 break;
1113
1114                         case SSL3_MT_CERTIFICATE_REQUEST:
1115                                 str_details1 = ", CertificateRequest";
1116                                 break;
1117
1118                         case SSL3_MT_SERVER_DONE:
1119                                 str_details1 = ", ServerHelloDone";
1120                                 break;
1121
1122                         case SSL3_MT_CERTIFICATE_VERIFY:
1123                                 str_details1 = ", CertificateVerify";
1124                                 break;
1125
1126                         case SSL3_MT_CLIENT_KEY_EXCHANGE:
1127                                 str_details1 = ", ClientKeyExchange";
1128                                 break;
1129
1130                         case SSL3_MT_FINISHED:
1131                                 str_details1 = ", Finished";
1132                                 break;
1133                         }
1134                 }
1135         }
1136
1137         snprintf(tls_session->info.info_description,
1138                  sizeof(tls_session->info.info_description),
1139                  "%s %s%s [length %04lx]%s%s\n",
1140                  str_write_p, str_version, str_content_type,
1141                  (unsigned long)tls_session->info.record_len,
1142                  str_details1, str_details2);
1143
1144         request = SSL_get_ex_data(tls_session->ssl, FR_TLS_EX_INDEX_REQUEST);
1145         ROPTIONAL(RDEBUG2, DEBUG2, "%s", tls_session->info.info_description);
1146 }
1147
1148 static CONF_PARSER cache_config[] = {
1149         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, session_cache_enable), "no" },
1150
1151         { "lifetime", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_timeout), "24" },
1152         { "name", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_id_name), NULL },
1153
1154         { "max_entries", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, session_cache_size), "255" },
1155         { "persist_dir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, session_cache_path), NULL },
1156         CONF_PARSER_TERMINATOR
1157 };
1158
1159 static CONF_PARSER verify_config[] = {
1160         { "skip_if_ocsp_ok", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, verify_skip_if_ocsp_ok), "no" },
1161         { "tmpdir", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_tmp_dir), NULL },
1162         { "client", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, verify_client_cert_cmd), NULL },
1163         CONF_PARSER_TERMINATOR
1164 };
1165
1166 #ifdef HAVE_OPENSSL_OCSP_H
1167 static CONF_PARSER ocsp_config[] = {
1168         { "enable", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_enable), "no" },
1169         { "override_cert_url", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_override_url), "no" },
1170         { "url", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ocsp_url), NULL },
1171         { "use_nonce", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_use_nonce), "yes" },
1172         { "timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, ocsp_timeout), "yes" },
1173         { "softfail", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, ocsp_softfail), "no" },
1174         CONF_PARSER_TERMINATOR
1175 };
1176 #endif
1177
1178 static CONF_PARSER tls_server_config[] = {
1179         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1180         { "CA_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_path), NULL },
1181         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1182         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1183         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1184         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1185         { "CA_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT | PW_TYPE_DEPRECATED, fr_tls_server_conf_t, ca_file), NULL },
1186         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1187         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1188 #ifdef PSK_MAX_IDENTITY_LEN
1189         { "psk_identity", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_identity), NULL },
1190         { "psk_hexphrase", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, psk_password), NULL },
1191         { "psk_query", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, psk_query), NULL },
1192 #endif
1193         { "dh_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, dh_file), NULL },
1194         { "random_file", FR_CONF_OFFSET(PW_TYPE_FILE_EXISTS, fr_tls_server_conf_t, random_file), NULL },
1195         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1196         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1197         { "auto_chain", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, auto_chain), "yes" },
1198         { "disable_single_dh_use", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_single_dh_use), NULL },
1199         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1200 #ifdef X509_V_FLAG_CRL_CHECK_ALL
1201         { "check_all_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_all_crl), "no" },
1202 #endif
1203         { "allow_expired_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, allow_expired_crl), NULL },
1204         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1205         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1206         { "cipher_server_preference", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, cipher_server_preference), NULL },
1207         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1208         { "require_client_cert", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, require_client_cert), NULL },
1209
1210 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1211 #ifndef OPENSSL_NO_ECDH
1212         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1213 #endif
1214 #endif
1215
1216 #ifdef SSL_OP_NO_TLSv1
1217         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1218 #endif
1219
1220 #ifdef SSL_OP_NO_TLSv1_1
1221         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1222 #endif
1223
1224 #ifdef SSL_OP_NO_TLSv1_2
1225         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1226 #endif
1227
1228         { "cache", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) cache_config },
1229
1230         { "verify", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) verify_config },
1231
1232 #ifdef HAVE_OPENSSL_OCSP_H
1233         { "ocsp", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) ocsp_config },
1234 #endif
1235         CONF_PARSER_TERMINATOR
1236 };
1237
1238
1239 static CONF_PARSER tls_client_config[] = {
1240         { "verify_depth", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, verify_depth), "0" },
1241         { "ca_path", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_path), NULL },
1242         { "pem_file_type", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, file_type), "yes" },
1243         { "private_key_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, private_key_file), NULL },
1244         { "certificate_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, certificate_file), NULL },
1245         { "ca_file", FR_CONF_OFFSET(PW_TYPE_FILE_INPUT, fr_tls_server_conf_t, ca_file), NULL },
1246         { "private_key_password", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_SECRET, fr_tls_server_conf_t, private_key_password), NULL },
1247         { "dh_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, dh_file), NULL },
1248         { "random_file", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, random_file), NULL },
1249         { "fragment_size", FR_CONF_OFFSET(PW_TYPE_INTEGER, fr_tls_server_conf_t, fragment_size), "1024" },
1250         { "include_length", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, include_length), "yes" },
1251         { "check_crl", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, check_crl), "no" },
1252         { "check_cert_cn", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_cn), NULL },
1253         { "cipher_list", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, cipher_list), NULL },
1254         { "check_cert_issuer", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, check_cert_issuer), NULL },
1255
1256 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
1257 #ifndef OPENSSL_NO_ECDH
1258         { "ecdh_curve", FR_CONF_OFFSET(PW_TYPE_STRING, fr_tls_server_conf_t, ecdh_curve), "prime256v1" },
1259 #endif
1260 #endif
1261
1262 #ifdef SSL_OP_NO_TLSv1
1263         { "disable_tlsv1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1), NULL },
1264 #endif
1265
1266 #ifdef SSL_OP_NO_TLSv1_1
1267         { "disable_tlsv1_1", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_1), NULL },
1268 #endif
1269
1270 #ifdef SSL_OP_NO_TLSv1_2
1271         { "disable_tlsv1_2", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, fr_tls_server_conf_t, disable_tlsv1_2), NULL },
1272 #endif
1273         CONF_PARSER_TERMINATOR
1274 };
1275
1276
1277 /*
1278  *      TODO: Check for the type of key exchange * like conf->dh_key
1279  */
1280 static int load_dh_params(SSL_CTX *ctx, char *file)
1281 {
1282         DH *dh = NULL;
1283         BIO *bio;
1284
1285         if (!file) return 0;
1286
1287         if ((bio = BIO_new_file(file, "r")) == NULL) {
1288                 ERROR(LOG_PREFIX ": Unable to open DH file - %s", file);
1289                 return -1;
1290         }
1291
1292         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1293         BIO_free(bio);
1294         if (!dh) {
1295                 WARN(LOG_PREFIX ": Unable to set DH parameters.  DH cipher suites may not work!");
1296                 WARN(LOG_PREFIX ": Fix this by running the OpenSSL command listed in eap.conf");
1297                 return 0;
1298         }
1299
1300         if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
1301                 ERROR(LOG_PREFIX ": Unable to set DH parameters");
1302                 DH_free(dh);
1303                 return -1;
1304         }
1305
1306         DH_free(dh);
1307         return 0;
1308 }
1309
1310
1311 /*
1312  *      Print debugging messages, and free data.
1313  */
1314 static void cbtls_remove_session(SSL_CTX *ctx, SSL_SESSION *sess)
1315 {
1316         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1317         fr_tls_server_conf_t    *conf;
1318
1319         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1320
1321         conf = (fr_tls_server_conf_t *)SSL_CTX_get_app_data(ctx);
1322         if (!conf) {
1323                 DEBUG(LOG_PREFIX ": Failed to find TLS configuration in session");
1324                 return;
1325         }
1326
1327         {
1328                 int rv;
1329                 char filename[256];
1330
1331                 DEBUG2(LOG_PREFIX ": Removing session %s from the cache", buffer);
1332
1333                 /* remove session and any cached VPs */
1334                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1335                          conf->session_cache_path, FR_DIR_SEP, buffer);
1336                 rv = unlink(filename);
1337                 if (rv != 0) {
1338                         DEBUG2(LOG_PREFIX ": Could not remove persisted session file %s: %s",
1339                                filename, fr_syserror(errno));
1340                 }
1341                 /* VPs might be absent; might not have been written to disk yet */
1342                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1343                          conf->session_cache_path, FR_DIR_SEP, buffer);
1344                 unlink(filename);
1345         }
1346
1347         return;
1348 }
1349
1350 static int cbtls_new_session(SSL *ssl, SSL_SESSION *sess)
1351 {
1352         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1353         fr_tls_server_conf_t    *conf;
1354         unsigned char           *sess_blob = NULL;
1355
1356         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1357
1358         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1359         if (!conf) {
1360                 RWDEBUG("Failed to find TLS configuration in session");
1361                 return 0;
1362         }
1363
1364         tls_session_id(sess, buffer, MAX_SESSION_SIZE);
1365
1366         {
1367                 int fd, rv, todo, blob_len;
1368                 char filename[256];
1369                 unsigned char *p;
1370
1371                 RDEBUG2("Serialising session %s, and storing in cache", buffer);
1372
1373                 /* find out what length data we need */
1374                 blob_len = i2d_SSL_SESSION(sess, NULL);
1375                 if (blob_len < 1) {
1376                         /* something went wrong */
1377                         if (request) RWDEBUG("Session serialisation failed, couldn't determine required buffer length");
1378                         return 0;
1379                 }
1380
1381                 /* Do not convert to TALLOC - Thread safety */
1382                 /* alloc and convert to ASN.1 */
1383                 sess_blob = malloc(blob_len);
1384                 if (!sess_blob) {
1385                         RWDEBUG("Session serialisation failed, couldn't allocate buffer (%d bytes)", blob_len);
1386                         return 0;
1387                 }
1388                 /* openssl mutates &p */
1389                 p = sess_blob;
1390                 rv = i2d_SSL_SESSION(sess, &p);
1391                 if (rv != blob_len) {
1392                         if (request) RWDEBUG("Session serialisation failed");
1393                         goto error;
1394                 }
1395
1396                 /* open output file */
1397                 snprintf(filename, sizeof(filename), "%s%c%s.asn1",
1398                          conf->session_cache_path, FR_DIR_SEP, buffer);
1399                 fd = open(filename, O_RDWR|O_CREAT|O_EXCL, S_IWUSR);
1400                 if (fd < 0) {
1401                         if (request) RERROR("Session serialisation failed, failed opening session file %s: %s",
1402                                             filename, fr_syserror(errno));
1403                         goto error;
1404                 }
1405
1406                 /*
1407                  *      Set the filename to be temporarily write-only.
1408                  */
1409                 if (request) {
1410                         VALUE_PAIR *vp;
1411
1412                         vp = fr_pair_afrom_num(request->state_ctx, PW_TLS_CACHE_FILENAME, 0);
1413                         if (vp) {
1414                                 fr_pair_value_strcpy(vp, filename);
1415                                 fr_pair_add(&request->state, vp);
1416                         }
1417                 }
1418
1419                 todo = blob_len;
1420                 p = sess_blob;
1421                 while (todo > 0) {
1422                         rv = write(fd, p, todo);
1423                         if (rv < 1) {
1424                                 if (request) RWDEBUG("Failed writing session: %s", fr_syserror(errno));
1425                                 close(fd);
1426                                 goto error;
1427                         }
1428                         p += rv;
1429                         todo -= rv;
1430                 }
1431                 close(fd);
1432                 if (request) RWDEBUG("Wrote session %s to %s (%d bytes)", buffer, filename, blob_len);
1433         }
1434
1435 error:
1436         free(sess_blob);
1437
1438         return 0;
1439 }
1440
1441 /** Convert OpenSSL's ASN1_TIME to an epoch time
1442  *
1443  * @param[out] out      Where to write the time_t.
1444  * @param[in] asn1      The ASN1_TIME to convert.
1445  * @return
1446  *      - 0 success.
1447  *      - -1 on failure.
1448  */
1449 static int ocsp_asn1time_to_epoch(time_t *out, char const *asn1)
1450 {
1451         struct          tm t;
1452         char const      *p = asn1, *end = p + strlen(p);
1453
1454         memset(&t, 0, sizeof(t));
1455
1456         if ((end - p) <= 12) {
1457                 if ((end - p) < 2) {
1458                         fr_strerror_printf("ASN1 date string too short, expected 2 additional bytes, got %zu bytes",
1459                                            end - p);
1460                         return -1;
1461                 }
1462
1463                 t.tm_year = (*(p++) - '0') * 10;
1464                 t.tm_year += (*(p++) - '0');
1465                 if (t.tm_year < 70) t.tm_year += 100;
1466         } else {
1467                 t.tm_year = (*(p++) - '0') * 1000;
1468                 t.tm_year += (*(p++) - '0') * 100;
1469                 t.tm_year += (*(p++) - '0') * 10;
1470                 t.tm_year += (*(p++) - '0');
1471                 t.tm_year -= 1900;
1472         }
1473
1474         if ((end - p) < 10) {
1475                 fr_strerror_printf("ASN1 string too short, expected 10 additional bytes, got %zu bytes",
1476                                    end - p);
1477                 return -1;
1478         }
1479
1480         t.tm_mon = (*(p++) - '0') * 10;
1481         t.tm_mon += (*(p++) - '0') - 1; // -1 since January is 0 not 1.
1482         t.tm_mday = (*(p++) - '0') * 10;
1483         t.tm_mday += (*(p++) - '0');
1484         t.tm_hour = (*(p++) - '0') * 10;
1485         t.tm_hour += (*(p++) - '0');
1486         t.tm_min = (*(p++) - '0') * 10;
1487         t.tm_min += (*(p++) - '0');
1488         t.tm_sec = (*(p++) - '0') * 10;
1489         t.tm_sec += (*(p++) - '0');
1490
1491         /* Apparently OpenSSL converts all timestamps to UTC? Maybe? */
1492         *out = timegm(&t);
1493         return 0;
1494 }
1495
1496 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
1497 static SSL_SESSION *cbtls_get_session(SSL *ssl, unsigned char *data, int len, int *copy)
1498 #else
1499 static SSL_SESSION *cbtls_get_session(SSL *ssl, const unsigned char *data, int len, int *copy)
1500 #endif
1501 {
1502         size_t                  size;
1503         char                    buffer[2 * MAX_SESSION_SIZE + 1];
1504         fr_tls_server_conf_t    *conf;
1505         TALLOC_CTX              *talloc_ctx;
1506
1507         SSL_SESSION             *sess = NULL;
1508         unsigned char           *sess_data = NULL;
1509         PAIR_LIST               *pairlist = NULL;
1510
1511         REQUEST                 *request = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
1512
1513         rad_assert(request != NULL);
1514
1515         size = len;
1516         if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
1517
1518         fr_bin2hex(buffer, data, size);
1519
1520         RDEBUG2("Peer requested cached session: %s", buffer);
1521
1522         *copy = 0;
1523
1524         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
1525         if (!conf) {
1526                 RWDEBUG("Failed to find TLS configuration in session");
1527                 return NULL;
1528         }
1529
1530         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
1531
1532         {
1533                 int             rv, fd, todo;
1534                 char            filename[256];
1535
1536                 unsigned char const     **o;
1537                 unsigned char           **p;
1538                 uint8_t                 *q;
1539
1540                 struct stat     st;
1541                 VALUE_PAIR      *vps = NULL;
1542                 VALUE_PAIR      *vp;
1543
1544                 /* load the actual SSL session */
1545                 snprintf(filename, sizeof(filename), "%s%c%s.asn1", conf->session_cache_path, FR_DIR_SEP, buffer);
1546                 fd = open(filename, O_RDONLY);
1547                 if (fd < 0) {
1548                         RWDEBUG("No persisted session file %s: %s", filename, fr_syserror(errno));
1549                         goto error;
1550                 }
1551
1552                 rv = fstat(fd, &st);
1553                 if (rv < 0) {
1554                         RWDEBUG("Failed stating persisted session file %s: %s", filename, fr_syserror(errno));
1555                         close(fd);
1556                         goto error;
1557                 }
1558
1559                 sess_data = talloc_array(NULL, unsigned char, st.st_size);
1560                 if (!sess_data) {
1561                         RWDEBUG("Failed allocating buffer for persisted session (%d bytes)", (int) st.st_size);
1562                         close(fd);
1563                         goto error;
1564                 }
1565
1566                 q = sess_data;
1567                 todo = st.st_size;
1568                 while (todo > 0) {
1569                         rv = read(fd, q, todo);
1570                         if (rv < 1) {
1571                                 RWDEBUG("Failed reading persisted session: %s", fr_syserror(errno));
1572                                 close(fd);
1573                                 goto error;
1574                         }
1575                         todo -= rv;
1576                         q += rv;
1577                 }
1578                 close(fd);
1579
1580                 /*
1581                  *      OpenSSL mutates what's passed in, so we assign sess_data to q,
1582                  *      so the value of q gets mutated, and not the value of sess_data.
1583                  *
1584                  *      We then need a pointer to hold &q, but it can't be const, because
1585                  *      clang complains about lack of consting in nested pointer types.
1586                  *
1587                  *      So we memcpy the value of that pointer, to one that
1588                  *      does have a const, which we then pass into d2i_SSL_SESSION *sigh*.
1589                  */
1590                 q = sess_data;
1591                 p = &q;
1592                 memcpy(&o, &p, sizeof(o));
1593                 sess = d2i_SSL_SESSION(NULL, o, st.st_size);
1594                 if (!sess) {
1595                         RWDEBUG("Failed loading persisted session: %s", ERR_error_string(ERR_get_error(), NULL));
1596                         goto error;
1597                 }
1598
1599                 /* read in the cached VPs from the .vps file */
1600                 snprintf(filename, sizeof(filename), "%s%c%s.vps",
1601                          conf->session_cache_path, FR_DIR_SEP, buffer);
1602                 rv = pairlist_read(talloc_ctx, filename, &pairlist, 1);
1603                 if (rv < 0) {
1604                         /* not safe to un-persist a session w/o VPs */
1605                         RWDEBUG("Failed loading persisted VPs for session %s", buffer);
1606                         SSL_SESSION_free(sess);
1607                         goto error;
1608                 }
1609
1610                 /*
1611                  *      Enforce client certificate expiration.
1612                  */
1613                 vp = fr_pair_find_by_num(pairlist->reply, PW_TLS_CLIENT_CERT_EXPIRATION, 0, TAG_ANY);
1614                 if (vp) {
1615                         time_t expires;
1616
1617                         if (ocsp_asn1time_to_epoch(&expires, vp->vp_strvalue) < 0) {
1618                                 RDEBUG2("Failed getting certificate expiration, removing cache entry for session %s", buffer);
1619                                 SSL_SESSION_free(sess);
1620                                 goto error;
1621                         }
1622
1623                         if (expires <= request->timestamp) {
1624                                 RDEBUG2("Certificate has expired, removing cache entry for session %s", buffer);
1625                                 SSL_SESSION_free(sess);
1626                                 goto error;
1627                         }
1628
1629                         /*
1630                          *      Account for Session-Timeout, if it's available.
1631                          */
1632                         vp = fr_pair_find_by_num(request->reply->vps, PW_SESSION_TIMEOUT, 0, TAG_ANY);
1633                         if (vp) {
1634                                 if ((request->timestamp + vp->vp_integer) > expires) {
1635                                         vp->vp_integer = expires - request->timestamp;
1636                                         RWDEBUG2("Updating Session-Timeout to %u, due to impending certificate expiration",
1637                                                  vp->vp_integer);
1638                                 }
1639                         }
1640                 }
1641
1642                 /* move the cached VPs into the session */
1643                 fr_pair_list_mcopy_by_num(talloc_ctx, &vps, &pairlist->reply, 0, 0, TAG_ANY);
1644
1645                 SSL_SESSION_set_ex_data(sess, fr_tls_ex_index_vps, vps);
1646                 RWDEBUG("Successfully restored session %s", buffer);
1647                 rdebug_pair_list(L_DBG_LVL_2, request, vps, "reply:");
1648         }
1649 error:
1650         if (sess_data) talloc_free(sess_data);
1651         if (pairlist) pairlist_free(&pairlist);
1652
1653         return sess;
1654 }
1655
1656 #ifdef HAVE_OPENSSL_OCSP_H
1657
1658 /** Extract components of OCSP responser URL from a certificate
1659  *
1660  * @param[in] cert to extract URL from.
1661  * @param[out] host_out Portion of the URL (must be freed with free()).
1662  * @param[out] port_out Port portion of the URL (must be freed with free()).
1663  * @param[out] path_out Path portion of the URL (must be freed with free()).
1664  * @param[out] is_https Whether the responder should be contacted using https.
1665  * @return
1666  *      - 0 if no valid URL is contained in the certificate.
1667  *      - 1 if a URL was found and parsed.
1668  *      - -1 if at least one URL was found, but none could be parsed.
1669  */
1670 static int ocsp_parse_cert_url(X509 *cert, char **host_out, char **port_out,
1671                                char **path_out, int *is_https)
1672 {
1673         int                     i;
1674         bool                    found_uri = false;
1675
1676         AUTHORITY_INFO_ACCESS   *aia;
1677         ACCESS_DESCRIPTION      *ad;
1678
1679         aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
1680
1681         for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
1682                 ad = sk_ACCESS_DESCRIPTION_value(aia, i);
1683                 if (OBJ_obj2nid(ad->method) != NID_ad_OCSP) continue;
1684                 if (ad->location->type != GEN_URI) continue;
1685                 found_uri = true;
1686
1687                 if (OCSP_parse_url((char *) ad->location->d.ia5->data, host_out,
1688                                    port_out, path_out, is_https)) return 1;
1689         }
1690         return found_uri ? -1 : 0;
1691 }
1692
1693 /*
1694  * This function sends a OCSP request to a defined OCSP responder
1695  * and checks the OCSP response for correctness.
1696  */
1697
1698 /* Maximum leeway in validity period: default 5 minutes */
1699 #define MAX_VALIDITY_PERIOD     (5 * 60)
1700
1701 typedef enum {
1702         OCSP_STATUS_FAILED      = 0,
1703         OCSP_STATUS_OK          = 1,
1704         OCSP_STATUS_SKIPPED     = 2,
1705 } ocsp_status_t;
1706
1707 static ocsp_status_t ocsp_check(REQUEST *request, X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
1708                                 fr_tls_server_conf_t *conf)
1709 {
1710         OCSP_CERTID     *certid;
1711         OCSP_REQUEST    *req;
1712         OCSP_RESPONSE   *resp = NULL;
1713         OCSP_BASICRESP  *bresp = NULL;
1714         char            *host = NULL;
1715         char            *port = NULL;
1716         char            *path = NULL;
1717         char            hostheader[1024];
1718         int             use_ssl = -1;
1719         long            nsec = MAX_VALIDITY_PERIOD, maxage = -1;
1720         BIO             *cbio, *bio_out;
1721         ocsp_status_t   ocsp_status = OCSP_STATUS_FAILED;
1722         int             status;
1723         ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
1724         int             reason;
1725 #if OPENSSL_VERSION_NUMBER >= 0x1000003f
1726         OCSP_REQ_CTX    *ctx;
1727         int             rc;
1728         struct timeval  now;
1729         struct timeval  when;
1730 #endif
1731         VALUE_PAIR      *vp;
1732
1733         /*
1734          * Create OCSP Request
1735          */
1736         certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
1737         req = OCSP_REQUEST_new();
1738         OCSP_request_add0_id(req, certid);
1739         if (conf->ocsp_use_nonce) OCSP_request_add1_nonce(req, NULL, 8);
1740
1741         /*
1742          * Send OCSP Request and get OCSP Response
1743          */
1744
1745         /* Get OCSP responder URL */
1746         if (conf->ocsp_override_url) {
1747                 char *url;
1748
1749         use_ocsp_url:
1750                 memcpy(&url, &conf->ocsp_url, sizeof(url));
1751                 /* Reading the libssl src, they do a strdup on the URL, so it could of been const *sigh* */
1752                 OCSP_parse_url(url, &host, &port, &path, &use_ssl);
1753                 if (!host || !port || !path) {
1754                         RWDEBUG("ocsp: Host or port or path missing from configured URL \"%s\".  Not doing OCSP", url);
1755                         goto skipped;
1756                 }
1757         } else {
1758                 int ret;
1759
1760                 ret = ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
1761                 switch (ret) {
1762                 case -1:
1763                         RWDEBUG("ocsp: Invalid URL in certificate.  Not doing OCSP");
1764                         break;
1765
1766                 case 0:
1767                         if (conf->ocsp_url) {
1768                                 RWDEBUG("ocsp: No OCSP URL in certificate, falling back to configured URL");
1769                                 goto use_ocsp_url;
1770                         }
1771                         RWDEBUG("ocsp: No OCSP URL in certificate.  Not doing OCSP");
1772                         goto skipped;
1773
1774                 case 1:
1775                         break;
1776                 }
1777         }
1778
1779         RDEBUG2("ocsp: Using responder URL \"http://%s:%s%s\"", host, port, path);
1780
1781         /* Check host and port length are sane, then create Host: HTTP header */
1782         if ((strlen(host) + strlen(port) + 2) > sizeof(hostheader)) {
1783                 RWDEBUG("ocsp: Host and port too long");
1784                 goto skipped;
1785         }
1786         snprintf(hostheader, sizeof(hostheader), "%s:%s", host, port);
1787
1788         /* Setup BIO socket to OCSP responder */
1789         cbio = BIO_new_connect(host);
1790
1791         bio_out = NULL;
1792         if (rad_debug_lvl) {
1793                 if (default_log.dst == L_DST_STDOUT) {
1794                         bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
1795                 } else if (default_log.dst == L_DST_STDERR) {
1796                         bio_out = BIO_new_fp(stderr, BIO_NOCLOSE);
1797                 }
1798         }
1799
1800         BIO_set_conn_port(cbio, port);
1801 #if OPENSSL_VERSION_NUMBER < 0x1000003f
1802         BIO_do_connect(cbio);
1803
1804         /* Send OCSP request and wait for response */
1805         resp = OCSP_sendreq_bio(cbio, path, req);
1806         if (!resp) {
1807                 REDEBUG("ocsp: Couldn't get OCSP response");
1808                 ocsp_status = OCSP_STATUS_SKIPPED;
1809                 goto ocsp_end;
1810         }
1811 #else
1812         if (conf->ocsp_timeout)
1813                 BIO_set_nbio(cbio, 1);
1814
1815         rc = BIO_do_connect(cbio);
1816         if ((rc <= 0) && ((!conf->ocsp_timeout) || !BIO_should_retry(cbio))) {
1817                 REDEBUG("ocsp: Couldn't connect to OCSP responder");
1818                 ocsp_status = OCSP_STATUS_SKIPPED;
1819                 goto ocsp_end;
1820         }
1821
1822         ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
1823         if (!ctx) {
1824                 REDEBUG("ocsp: Couldn't create OCSP request");
1825                 ocsp_status = OCSP_STATUS_SKIPPED;
1826                 goto ocsp_end;
1827         }
1828
1829         if (!OCSP_REQ_CTX_add1_header(ctx, "Host", hostheader)) {
1830                 REDEBUG("ocsp: Couldn't set Host header");
1831                 ocsp_status = OCSP_STATUS_SKIPPED;
1832                 goto ocsp_end;
1833         }
1834
1835         if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
1836                 REDEBUG("ocsp: Couldn't add data to OCSP request");
1837                 ocsp_status = OCSP_STATUS_SKIPPED;
1838                 goto ocsp_end;
1839         }
1840
1841         gettimeofday(&when, NULL);
1842         when.tv_sec += conf->ocsp_timeout;
1843
1844         do {
1845                 rc = OCSP_sendreq_nbio(&resp, ctx);
1846                 if (conf->ocsp_timeout) {
1847                         gettimeofday(&now, NULL);
1848                         if (!timercmp(&now, &when, <))
1849                                 break;
1850                 }
1851         } while ((rc == -1) && BIO_should_retry(cbio));
1852
1853         if (conf->ocsp_timeout && (rc == -1) && BIO_should_retry(cbio)) {
1854                 REDEBUG("ocsp: Response timed out");
1855                 ocsp_status = OCSP_STATUS_SKIPPED;
1856                 goto ocsp_end;
1857         }
1858
1859         OCSP_REQ_CTX_free(ctx);
1860
1861         if (rc == 0) {
1862                 REDEBUG("ocsp: Couldn't get OCSP response");
1863                 ocsp_status = OCSP_STATUS_SKIPPED;
1864                 goto ocsp_end;
1865         }
1866 #endif
1867
1868         /* Verify OCSP response status */
1869         status = OCSP_response_status(resp);
1870         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
1871                 REDEBUG("ocsp: Response status: %s", OCSP_response_status_str(status));
1872                 goto ocsp_end;
1873         }
1874         bresp = OCSP_response_get1_basic(resp);
1875         if (conf->ocsp_use_nonce && OCSP_check_nonce(req, bresp)!=1) {
1876                 REDEBUG("ocsp: Response has wrong nonce value");
1877                 goto ocsp_end;
1878         }
1879         if (OCSP_basic_verify(bresp, NULL, store, 0)!=1){
1880                 REDEBUG("ocsp: Couldn't verify OCSP basic response");
1881                 goto ocsp_end;
1882         }
1883
1884         /*      Verify OCSP cert status */
1885         if (!OCSP_resp_find_status(bresp, certid, &status, &reason, &rev, &thisupd, &nextupd)) {
1886                 REDEBUG("ocsp: No Status found");
1887                 goto ocsp_end;
1888         }
1889
1890         if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage)) {
1891                 if (bio_out) {
1892                         BIO_puts(bio_out, "WARNING: Status times invalid.\n");
1893                         ERR_print_errors(bio_out);
1894                 }
1895                 goto ocsp_end;
1896         }
1897
1898         if (bio_out) {
1899                 BIO_puts(bio_out, "\tThis Update: ");
1900                 ASN1_GENERALIZEDTIME_print(bio_out, thisupd);
1901                 BIO_puts(bio_out, "\n");
1902                 if (nextupd) {
1903                         BIO_puts(bio_out, "\tNext Update: ");
1904                         ASN1_GENERALIZEDTIME_print(bio_out, nextupd);
1905                         BIO_puts(bio_out, "\n");
1906                 }
1907         }
1908
1909         switch (status) {
1910         case V_OCSP_CERTSTATUS_GOOD:
1911                 RDEBUG2("ocsp: Cert status: good");
1912                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1913                 vp->vp_integer = 1;     /* yes */
1914                 ocsp_status = OCSP_STATUS_OK;
1915                 break;
1916
1917         default:
1918                 /* REVOKED / UNKNOWN */
1919                 REDEBUG("ocsp: Cert status: %s", OCSP_cert_status_str(status));
1920                 if (reason != -1) REDEBUG("ocsp: Reason: %s", OCSP_crl_reason_str(reason));
1921
1922                 if (bio_out) {
1923                         BIO_puts(bio_out, "\tRevocation Time: ");
1924                         ASN1_GENERALIZEDTIME_print(bio_out, rev);
1925                         BIO_puts(bio_out, "\n");
1926                 }
1927                 break;
1928         }
1929
1930 ocsp_end:
1931         /* Free OCSP Stuff */
1932         OCSP_REQUEST_free(req);
1933         OCSP_RESPONSE_free(resp);
1934         free(host);
1935         free(port);
1936         free(path);
1937         BIO_free_all(cbio);
1938         if (bio_out) BIO_free(bio_out);
1939         OCSP_BASICRESP_free(bresp);
1940
1941         switch (ocsp_status) {
1942         case OCSP_STATUS_OK:
1943                 RDEBUG2("ocsp: Certificate is valid");
1944                 break;
1945
1946         case OCSP_STATUS_SKIPPED:
1947         skipped:
1948                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1949                 vp->vp_integer = 2;     /* skipped */
1950                 if (conf->ocsp_softfail) {
1951                         RWDEBUG("ocsp: Unable to check certificate, assuming it's valid");
1952                         RWDEBUG("ocsp: This may be insecure");
1953
1954                         /* Remove OpenSSL errors from queue or handshake will fail */
1955                         while (ERR_get_error());
1956
1957                         ocsp_status = OCSP_STATUS_SKIPPED;
1958                 } else {
1959                         REDEBUG("ocsp: Unable to check certificate, failing");
1960                         ocsp_status = OCSP_STATUS_FAILED;
1961                 }
1962                 break;
1963
1964         default:
1965                 vp = pair_make_request("TLS-OCSP-Cert-Valid", NULL, T_OP_SET);
1966                 vp->vp_integer = 0;     /* no */
1967                 REDEBUG("ocsp: Certificate has been expired/revoked");
1968                 break;
1969         }
1970
1971         return ocsp_status;
1972 }
1973 #endif  /* HAVE_OPENSSL_OCSP_H */
1974
1975 /*
1976  *      For creating certificate attributes.
1977  */
1978 static char const *cert_attr_names[8][2] = {
1979         { "TLS-Client-Cert-Serial",                     "TLS-Cert-Serial" },
1980         { "TLS-Client-Cert-Expiration",                 "TLS-Cert-Expiration" },
1981         { "TLS-Client-Cert-Subject",                    "TLS-Cert-Subject" },
1982         { "TLS-Client-Cert-Issuer",                     "TLS-Cert-Issuer" },
1983         { "TLS-Client-Cert-Common-Name",                "TLS-Cert-Common-Name" },
1984         { "TLS-Client-Cert-Subject-Alt-Name-Email",     "TLS-Cert-Subject-Alt-Name-Email" },
1985         { "TLS-Client-Cert-Subject-Alt-Name-Dns",       "TLS-Cert-Subject-Alt-Name-Dns" },
1986         { "TLS-Client-Cert-Subject-Alt-Name-Upn",       "TLS-Cert-Subject-Alt-Name-Upn" }
1987 };
1988
1989 #define FR_TLS_SERIAL           (0)
1990 #define FR_TLS_EXPIRATION       (1)
1991 #define FR_TLS_SUBJECT          (2)
1992 #define FR_TLS_ISSUER           (3)
1993 #define FR_TLS_CN               (4)
1994 #define FR_TLS_SAN_EMAIL        (5)
1995 #define FR_TLS_SAN_DNS          (6)
1996 #define FR_TLS_SAN_UPN          (7)
1997
1998 /*
1999  *      Before trusting a certificate, you must make sure that the
2000  *      certificate is 'valid'. There are several steps that your
2001  *      application can take in determining if a certificate is
2002  *      valid. Commonly used steps are:
2003  *
2004  *      1.Verifying the certificate's signature, and verifying that
2005  *      the certificate has been issued by a trusted Certificate
2006  *      Authority.
2007  *
2008  *      2.Verifying that the certificate is valid for the present date
2009  *      (i.e. it is being presented within its validity dates).
2010  *
2011  *      3.Verifying that the certificate has not been revoked by its
2012  *      issuing Certificate Authority, by checking with respect to a
2013  *      Certificate Revocation List (CRL).
2014  *
2015  *      4.Verifying that the credentials presented by the certificate
2016  *      fulfill additional requirements specific to the application,
2017  *      such as with respect to access control lists or with respect
2018  *      to OCSP (Online Certificate Status Processing).
2019  *
2020  *      NOTE: This callback will be called multiple times based on the
2021  *      depth of the root certificate chain
2022  */
2023 int cbtls_verify(int ok, X509_STORE_CTX *ctx)
2024 {
2025         char            subject[1024]; /* Used for the subject name */
2026         char            issuer[1024]; /* Used for the issuer name */
2027         char            attribute[1024];
2028         char            value[1024];
2029         char            common_name[1024];
2030         char            cn_str[1024];
2031         char            buf[64];
2032         X509            *client_cert;
2033 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
2034         const STACK_OF(X509_EXTENSION) *ext_list;
2035 #else
2036         STACK_OF(X509_EXTENSION) *ext_list;
2037 #endif
2038         SSL             *ssl;
2039         int             err, depth, lookup, loc;
2040         fr_tls_server_conf_t *conf;
2041         int             my_ok = ok;
2042
2043         ASN1_INTEGER    *sn = NULL;
2044         ASN1_TIME       *asn_time = NULL;
2045         VALUE_PAIR      **certs;
2046         char **identity;
2047 #ifdef HAVE_OPENSSL_OCSP_H
2048         X509_STORE      *ocsp_store = NULL;
2049         X509            *issuer_cert;
2050         bool            do_verify = false;
2051 #endif
2052         VALUE_PAIR      *vp;
2053         TALLOC_CTX      *talloc_ctx;
2054
2055         REQUEST         *request;
2056
2057         client_cert = X509_STORE_CTX_get_current_cert(ctx);
2058         err = X509_STORE_CTX_get_error(ctx);
2059         depth = X509_STORE_CTX_get_error_depth(ctx);
2060
2061         lookup = depth;
2062
2063         /*
2064          *      Log client/issuing cert.  If there's an error, log
2065          *      issuing cert.
2066          */
2067         if ((lookup > 1) && !my_ok) lookup = 1;
2068
2069         /*
2070          * Retrieve the pointer to the SSL of the connection currently treated
2071          * and the application specific data stored into the SSL object.
2072          */
2073         ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
2074         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_CONF);
2075         if (!conf) return 1;
2076
2077         request = (REQUEST *)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_REQUEST);
2078         rad_assert(request != NULL);
2079         certs = (VALUE_PAIR **)SSL_get_ex_data(ssl, fr_tls_ex_index_certs);
2080
2081         identity = (char **)SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_IDENTITY);
2082 #ifdef HAVE_OPENSSL_OCSP_H
2083         ocsp_store = conf->ocsp_store;
2084 #endif
2085
2086         talloc_ctx = SSL_get_ex_data(ssl, FR_TLS_EX_INDEX_TALLOC);
2087
2088         /*
2089          *      Get the Serial Number
2090          */
2091         buf[0] = '\0';
2092         sn = X509_get_serialNumber(client_cert);
2093
2094         RDEBUG2("Creating attributes from certificate OIDs");
2095         RINDENT();
2096
2097         /*
2098          *      For this next bit, we create the attributes *only* if
2099          *      we're at the client or issuing certificate, AND we
2100          *      have a user identity.  i.e. we don't create the
2101          *      attributes for RadSec connections.
2102          */
2103         if (certs && identity &&
2104             (lookup <= 1) && sn && ((size_t) sn->length < (sizeof(buf) / 2))) {
2105                 char *p = buf;
2106                 int i;
2107
2108                 for (i = 0; i < sn->length; i++) {
2109                         sprintf(p, "%02x", (unsigned int)sn->data[i]);
2110                         p += 2;
2111                 }
2112                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SERIAL][lookup], buf, T_OP_SET);
2113                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2114         }
2115
2116
2117         /*
2118          *      Get the Expiration Date
2119          */
2120         buf[0] = '\0';
2121         asn_time = X509_get_notAfter(client_cert);
2122         if (certs && identity && (lookup <= 1) && asn_time &&
2123             (asn_time->length < (int) sizeof(buf))) {
2124                 memcpy(buf, (char*) asn_time->data, asn_time->length);
2125                 buf[asn_time->length] = '\0';
2126                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_EXPIRATION][lookup], buf, T_OP_SET);
2127                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2128         }
2129
2130         /*
2131          *      Get the Subject & Issuer
2132          */
2133         subject[0] = issuer[0] = '\0';
2134         X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
2135                           sizeof(subject));
2136         subject[sizeof(subject) - 1] = '\0';
2137         if (certs && identity && (lookup <= 1) && subject[0]) {
2138                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SUBJECT][lookup], subject, T_OP_SET);
2139                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2140         }
2141
2142         X509_NAME_oneline(X509_get_issuer_name(client_cert), issuer,
2143                           sizeof(issuer));
2144         issuer[sizeof(issuer) - 1] = '\0';
2145         if (certs && identity && (lookup <= 1) && issuer[0]) {
2146                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_ISSUER][lookup], issuer, T_OP_SET);
2147                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2148         }
2149
2150         /*
2151          *      Get the Common Name, if there is a subject.
2152          */
2153         X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
2154                                   NID_commonName, common_name, sizeof(common_name));
2155         common_name[sizeof(common_name) - 1] = '\0';
2156         if (certs && identity && (lookup <= 1) && common_name[0] && subject[0]) {
2157                 vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_CN][lookup], common_name, T_OP_SET);
2158                 rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2159         }
2160
2161         /*
2162          *      Get the RFC822 Subject Alternative Name
2163          */
2164         loc = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, -1);
2165         if (certs && (lookup <= 1) && (loc >= 0)) {
2166                 X509_EXTENSION *ext = NULL;
2167                 GENERAL_NAMES *names = NULL;
2168                 int i;
2169
2170                 if ((ext = X509_get_ext(client_cert, loc)) &&
2171                     (names = X509V3_EXT_d2i(ext))) {
2172                         for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
2173                                 GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
2174
2175                                 switch (name->type) {
2176 #ifdef GEN_EMAIL
2177                                 case GEN_EMAIL:
2178                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_EMAIL][lookup],
2179                                                       (char const *) ASN1_STRING_get0_data(name->d.rfc822Name), T_OP_SET);
2180                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2181                                         break;
2182 #endif  /* GEN_EMAIL */
2183 #ifdef GEN_DNS
2184                                 case GEN_DNS:
2185                                         vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_DNS][lookup],
2186                                                       (char const *) ASN1_STRING_get0_data(name->d.dNSName), T_OP_SET);
2187                                         rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2188                                         break;
2189 #endif  /* GEN_DNS */
2190 #ifdef GEN_OTHERNAME
2191                                 case GEN_OTHERNAME:
2192                                         /* look for a MS UPN */
2193                                         if (NID_ms_upn == OBJ_obj2nid(name->d.otherName->type_id)) {
2194                                             /* we've got a UPN - Must be ASN1-encoded UTF8 string */
2195                                             if (name->d.otherName->value->type == V_ASN1_UTF8STRING) {
2196                                                     vp = fr_pair_make(talloc_ctx, certs, cert_attr_names[FR_TLS_SAN_UPN][lookup],
2197                                                                   (char const *) ASN1_STRING_get0_data(name->d.otherName->value->value.utf8string), T_OP_SET);
2198                                                     rdebug_pair(L_DBG_LVL_2, request, vp, NULL);
2199                                                 break;
2200                                             } else {
2201                                                 RWARN("Invalid UPN in Subject Alt Name (should be UTF-8)");
2202                                                 break;
2203                                             }
2204                                         }
2205                                         break;
2206 #endif  /* GEN_OTHERNAME */
2207                                 default:
2208                                         /* XXX TODO handle other SAN types */
2209                                         break;
2210                                 }
2211                         }
2212                 }
2213                 if (names != NULL)
2214                         sk_GENERAL_NAME_free(names);
2215         }
2216
2217         /*
2218          *      If the CRL has expired, that might still be OK.
2219          */
2220         if (!my_ok &&
2221             (conf->allow_expired_crl) &&
2222             (err == X509_V_ERR_CRL_HAS_EXPIRED)) {
2223                 my_ok = 1;
2224                 X509_STORE_CTX_set_error( ctx, 0 );
2225         }
2226
2227         if (!my_ok) {
2228                 char const *p = X509_verify_cert_error_string(err);
2229                 RERROR("SSL says error %d : %s", err, p);
2230                 REXDENT();
2231                 return my_ok;
2232         }
2233
2234         if (lookup == 0) {
2235 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
2236                 ext_list = X509_get0_extensions(client_cert);
2237 #else
2238                 X509_CINF       *client_inf;
2239                 client_inf = client_cert->cert_info;
2240                 ext_list = client_inf->extensions;
2241 #endif
2242         } else {
2243                 ext_list = NULL;
2244         }
2245
2246         /*
2247          *      Grab the X509 extensions, and create attributes out of them.
2248          *      For laziness, we re-use the OpenSSL names
2249          */
2250         if (certs && (sk_X509_EXTENSION_num(ext_list) > 0)) {
2251                 int i, len;
2252                 char *p;
2253                 BIO *out;
2254
2255                 out = BIO_new(BIO_s_mem());
2256                 strlcpy(attribute, "TLS-Client-Cert-", sizeof(attribute));
2257
2258                 for (i = 0; i < sk_X509_EXTENSION_num(ext_list); i++) {
2259                         ASN1_OBJECT *obj;
2260                         X509_EXTENSION *ext;
2261
2262                         ext = sk_X509_EXTENSION_value(ext_list, i);
2263
2264                         obj = X509_EXTENSION_get_object(ext);
2265                         i2a_ASN1_OBJECT(out, obj);
2266                         len = BIO_read(out, attribute + 16 , sizeof(attribute) - 16 - 1);
2267                         if (len <= 0) continue;
2268
2269                         attribute[16 + len] = '\0';
2270
2271                         for (p = attribute + 16; *p != '\0'; p++) {
2272                                 if (*p == ' ') *p = '-';
2273                         }
2274
2275                         X509V3_EXT_print(out, ext, 0, 0);
2276                         len = BIO_read(out, value , sizeof(value) - 1);
2277                         if (len <= 0) continue;
2278
2279                         value[len] = '\0';
2280
2281                         vp = fr_pair_make(talloc_ctx, certs, attribute, value, T_OP_ADD);
2282                         if (!vp) {
2283                                 RDEBUG3("Skipping %s += '%s'.  Please check that both the "
2284                                         "attribute and value are defined in the dictionaries",
2285                                         attribute, value);
2286                         } else {
2287                                 /*
2288                                  *      rdebug_pair_list indents (so pre REXDENT())
2289                                  */
2290                                 REXDENT();
2291                                 rdebug_pair_list(L_DBG_LVL_2, request, vp, NULL);
2292                                 RINDENT();
2293                         }
2294                 }
2295
2296                 BIO_free_all(out);
2297         }
2298
2299         REXDENT();
2300
2301         switch (X509_STORE_CTX_get_error(ctx)) {
2302         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2303                 RERROR("issuer=%s", issuer);
2304                 break;
2305
2306         case X509_V_ERR_CERT_NOT_YET_VALID:
2307         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2308                 RERROR("notBefore=");
2309 #if 0
2310                 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
2311 #endif
2312                 break;
2313
2314         case X509_V_ERR_CERT_HAS_EXPIRED:
2315         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2316                 RERROR("notAfter=");
2317 #if 0
2318                 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
2319 #endif
2320                 break;
2321         }
2322
2323         /*
2324          *      If we're at the actual client cert, apply additional
2325          *      checks.
2326          */
2327         if (depth == 0) {
2328                 /*
2329                  *      If the conf tells us to, check cert issuer
2330                  *      against the specified value and fail
2331                  *      verification if they don't match.
2332                  */
2333                 if (conf->check_cert_issuer &&
2334                     (strcmp(issuer, conf->check_cert_issuer) != 0)) {
2335                         AUTH(LOG_PREFIX ": Certificate issuer (%s) does not match specified value (%s)!",
2336                              issuer, conf->check_cert_issuer);
2337                         my_ok = 0;
2338                 }
2339
2340                 /*
2341                  *      If the conf tells us to, check the CN in the
2342                  *      cert against xlat'ed value, but only if the
2343                  *      previous checks passed.
2344                  */
2345                 if (my_ok && conf->check_cert_cn) {
2346                         if (radius_xlat(cn_str, sizeof(cn_str), request, conf->check_cert_cn, NULL, NULL) < 0) {
2347                                 /* if this fails, fail the verification */
2348                                 my_ok = 0;
2349                         } else {
2350                                 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
2351                                 if (strcmp(cn_str, common_name) != 0) {
2352                                         AUTH(LOG_PREFIX ": Certificate CN (%s) does not match specified value (%s)!",
2353                                              common_name, cn_str);
2354                                         my_ok = 0;
2355                                 }
2356                         }
2357                 } /* check_cert_cn */
2358
2359 #ifdef HAVE_OPENSSL_OCSP_H
2360                 if (my_ok) {
2361                         /*
2362                          *      No OCSP, allow external verification.
2363                          */
2364                         if (!conf->ocsp_enable) {
2365                                 do_verify = true;
2366
2367                         } else {
2368                                 RDEBUG2("Starting OCSP Request");
2369                                 if ((X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert) != 1) ||
2370                                     !issuer_cert) {
2371                                         /*
2372                                          *      Allow for external verify.
2373                                          */
2374                                         RERROR("Couldn't get issuer_cert for %s", common_name);
2375                                         do_verify = true;
2376
2377                                 } else {
2378                                         /*
2379                                          *      Do the full OCSP checks.
2380                                          *
2381                                          *      If they fail, don't run the external verify.  We don't want
2382                                          *      to allow admins to force authentication success for bad
2383                                          *      certificates.
2384                                          *
2385                                          *      If the OCSP checks succeed, check whether we still want to
2386                                          *      run the external verification routine.  If it's marked as
2387                                          *      "skip verify on OK", then we don't do verify.
2388                                          */
2389                                         my_ok = ocsp_check(request, ocsp_store, issuer_cert, client_cert, conf);
2390                                         if (my_ok != OCSP_STATUS_FAILED) {
2391                                                 do_verify = !conf->verify_skip_if_ocsp_ok;
2392                                         }
2393                                 }
2394                         }
2395                 }
2396 #endif
2397
2398                 if ((my_ok != OCSP_STATUS_FAILED)
2399 #ifdef HAVE_OPENSSL_OCSP_H
2400                     && do_verify
2401 #endif
2402                         ) while (conf->verify_client_cert_cmd) {
2403                         char filename[256];
2404                         int fd;
2405                         FILE *fp;
2406
2407                         snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
2408                                  conf->verify_tmp_dir, main_config.name);
2409                         fd = mkstemp(filename);
2410                         if (fd < 0) {
2411                                 RDEBUG("Failed creating file in %s: %s",
2412                                        conf->verify_tmp_dir, fr_syserror(errno));
2413                                 break;
2414                         }
2415
2416                         fp = fdopen(fd, "w");
2417                         if (!fp) {
2418                                 close(fd);
2419                                 RDEBUG("Failed opening file %s: %s",
2420                                        filename, fr_syserror(errno));
2421                                 break;
2422                         }
2423
2424                         if (!PEM_write_X509(fp, client_cert)) {
2425                                 fclose(fp);
2426                                 RDEBUG("Failed writing certificate to file");
2427                                 goto do_unlink;
2428                         }
2429                         fclose(fp);
2430
2431                         if (!pair_make_request("TLS-Client-Cert-Filename",
2432                                              filename, T_OP_SET)) {
2433                                 RDEBUG("Failed creating TLS-Client-Cert-Filename");
2434
2435                                 goto do_unlink;
2436                         }
2437
2438                         RDEBUG("Verifying client certificate: %s", conf->verify_client_cert_cmd);
2439                         if (radius_exec_program(request, NULL, 0, NULL, request, conf->verify_client_cert_cmd,
2440                                                 request->packet->vps,
2441                                                 true, true, EXEC_TIMEOUT) != 0) {
2442                                 AUTH(LOG_PREFIX ": Certificate CN (%s) fails external verification!", common_name);
2443                                 my_ok = 0;
2444
2445                         } else  if (request) {
2446                                 RDEBUG("Client certificate CN %s passed external validation", common_name);
2447                         }
2448
2449                 do_unlink:
2450                         unlink(filename);
2451                         break;
2452                 }
2453         } /* depth == 0 */
2454
2455         if (certs && request && !my_ok) {
2456                 fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
2457         }
2458
2459         if (RDEBUG_ENABLED3) {
2460                 RDEBUG3("chain-depth   : %d", depth);
2461                 RDEBUG3("error         : %d", err);
2462
2463                 if (identity) RDEBUG3("identity      : %s", *identity);
2464                 RDEBUG3("common name   : %s", common_name);
2465                 RDEBUG3("subject       : %s", subject);
2466                 RDEBUG3("issuer        : %s", issuer);
2467                 RDEBUG3("verify return : %d", my_ok);
2468         }
2469
2470         return (my_ok != 0);
2471 }
2472
2473
2474 #ifdef HAVE_OPENSSL_OCSP_H
2475 /*
2476  *      Create Global X509 revocation store and use it to verify
2477  *      OCSP responses
2478  *
2479  *      - Load the trusted CAs
2480  *      - Load the trusted issuer certificates
2481  */
2482 static X509_STORE *init_revocation_store(fr_tls_server_conf_t *conf)
2483 {
2484         X509_STORE *store = NULL;
2485
2486         store = X509_STORE_new();
2487
2488         /* Load the CAs we trust */
2489         if (conf->ca_file || conf->ca_path)
2490                 if (!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
2491                         tls_error_log(NULL, "Error reading Trusted root CA list \"%s\"", conf->ca_file);
2492                         return NULL;
2493                 }
2494
2495 #ifdef X509_V_FLAG_CRL_CHECK
2496         if (conf->check_crl)
2497                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
2498 #endif
2499 #ifdef X509_V_FLAG_CRL_CHECK_ALL
2500         if (conf->check_all_crl)
2501                 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK_ALL);
2502 #endif
2503         return store;
2504 }
2505 #endif  /* HAVE_OPENSSL_OCSP_H */
2506
2507 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2508 #ifndef OPENSSL_NO_ECDH
2509 static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve, bool disable_single_dh_use)
2510 {
2511         int      nid;
2512         EC_KEY  *ecdh;
2513
2514         if (!ecdh_curve || !*ecdh_curve) return 0;
2515
2516         nid = OBJ_sn2nid(ecdh_curve);
2517         if (!nid) {
2518                 ERROR(LOG_PREFIX ": Unknown ecdh_curve \"%s\"", ecdh_curve);
2519                 return -1;
2520         }
2521
2522         ecdh = EC_KEY_new_by_curve_name(nid);
2523         if (!ecdh) {
2524                 ERROR(LOG_PREFIX ": Unable to create new curve \"%s\"", ecdh_curve);
2525                 return -1;
2526         }
2527
2528         SSL_CTX_set_tmp_ecdh(ctx, ecdh);
2529
2530         if (!disable_single_dh_use) {
2531                 SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
2532         }
2533
2534         EC_KEY_free(ecdh);
2535
2536         return 0;
2537 }
2538 #endif
2539 #endif
2540
2541 /*
2542  * DIE OPENSSL DIE DIE DIE
2543  *
2544  * What a palaver, just to free some data attached the
2545  * session. We need to do this because the "remove" callback
2546  * is called when refcount > 0 sometimes, if another thread
2547  * is using the session
2548  */
2549 static void sess_free_vps(UNUSED void *parent, void *data_ptr,
2550                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2551                                 UNUSED long argl, UNUSED void *argp)
2552 {
2553         VALUE_PAIR *vp = data_ptr;
2554         if (!vp) return;
2555
2556         DEBUG2(LOG_PREFIX ": Freeing cached session VPs");
2557
2558         fr_pair_list_free(&vp);
2559 }
2560
2561 static void sess_free_certs(UNUSED void *parent, void *data_ptr,
2562                                 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
2563                                 UNUSED long argl, UNUSED void *argp)
2564 {
2565         VALUE_PAIR **certs = data_ptr;
2566         if (!certs) return;
2567
2568         DEBUG2(LOG_PREFIX ": Freeing cached session Certificates");
2569
2570         fr_pair_list_free(certs);
2571 }
2572
2573 /** Add all the default ciphers and message digests reate our context.
2574  *
2575  * This should be called exactly once from main, before reading the main config
2576  * or initialising any modules.
2577  */
2578 void tls_global_init(void)
2579 {
2580         SSL_load_error_strings();       /* readable error messages (examples show call before library_init) */
2581         SSL_library_init();             /* initialize library */
2582         OpenSSL_add_all_algorithms();   /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
2583         CONF_modules_load_file(NULL, NULL, 0);
2584
2585         /*
2586          *      Initialize the index for the certificates.
2587          */
2588         fr_tls_ex_index_certs = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_certs);
2589 }
2590
2591 #ifdef ENABLE_OPENSSL_VERSION_CHECK
2592 /** Check for vulnerable versions of libssl
2593  *
2594  * @param acknowledged The highest CVE number a user has confirmed is not present in the system's libssl.
2595  * @return 0 if the CVE specified by the user matches the most recent CVE we have, else -1.
2596  */
2597 int tls_global_version_check(char const *acknowledged)
2598 {
2599         uint64_t v;
2600         bool bad = false;
2601         size_t i;
2602
2603         if (strcmp(acknowledged, "yes") == 0) return 0;
2604
2605         /* Check for bad versions */
2606         v = (uint64_t) SSLeay();
2607
2608         for (i = 0; i < (sizeof(libssl_defects) / sizeof(*libssl_defects)); i++) {
2609                 libssl_defect_t *defect = &libssl_defects[i];
2610
2611                 if ((v >= defect->low) && (v <= defect->high)) {
2612                         /*
2613                          *      If the CVE is acknowledged, allow it.
2614                          */
2615                         if (!bad && (strcmp(acknowledged, defect->id) == 0)) return 0;
2616
2617                         ERROR("Refusing to start with libssl version %s (in range %s)",
2618                               ssl_version(), ssl_version_range(defect->low, defect->high));
2619                         ERROR("Security advisory %s (%s)", defect->id, defect->name);
2620                         ERROR("%s", defect->comment);
2621
2622                         /*
2623                          *      Only warn about the first one...
2624                          */
2625                         if (!bad) {
2626                                 INFO("Once you have verified libssl has been correctly patched, "
2627                                      "set security.allow_vulnerable_openssl = '%s'", defect->id);
2628
2629                                 bad = true;
2630                         }
2631                 }
2632         }
2633
2634         if (bad) return -1;
2635
2636         return 0;
2637 }
2638 #endif
2639
2640 /** Free any memory alloced by libssl
2641  *
2642  */
2643 void tls_global_cleanup(void)
2644 {
2645 #if OPENSSL_VERSION_NUMBER < 0x10000000L
2646         ERR_remove_state(0);
2647 #elif OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
2648         ERR_remove_thread_state(NULL);
2649 #endif
2650         ENGINE_cleanup();
2651         CONF_modules_unload(1);
2652         ERR_free_strings();
2653         EVP_cleanup();
2654         CRYPTO_cleanup_all_ex_data();
2655 }
2656
2657 /** Create SSL context
2658  *
2659  * - Load the trusted CAs
2660  * - Load the Private key & the certificate
2661  * - Set the Context options & Verify options
2662  */
2663 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client)
2664 {
2665         SSL_CTX         *ctx;
2666         X509_STORE      *certstore;
2667         int             verify_mode = SSL_VERIFY_NONE;
2668         int             ctx_options = 0;
2669         int             ctx_tls_versions = 0;
2670         int             type;
2671
2672         /*
2673          *      SHA256 is in all versions of OpenSSL, but isn't
2674          *      initialized by default.  It's needed for WiMAX
2675          *      certificates.
2676          */
2677 #ifdef HAVE_OPENSSL_EVP_SHA256
2678         EVP_add_digest(EVP_sha256());
2679 #endif
2680
2681         ctx = SSL_CTX_new(SSLv23_method()); /* which is really "all known SSL / TLS methods".  Idiots. */
2682         if (!ctx) {
2683                 tls_error_log(NULL, "Failed creating TLS context");
2684                 return NULL;
2685         }
2686
2687         /*
2688          * Save the config on the context so that callbacks which
2689          * only get SSL_CTX* e.g. session persistence, can get it
2690          */
2691         SSL_CTX_set_app_data(ctx, conf);
2692
2693         /*
2694          * Identify the type of certificates that needs to be loaded
2695          */
2696         if (conf->file_type) {
2697                 type = SSL_FILETYPE_PEM;
2698         } else {
2699                 type = SSL_FILETYPE_ASN1;
2700         }
2701
2702         /*
2703          * Set the password to load private key
2704          */
2705         if (conf->private_key_password) {
2706 #ifdef __APPLE__
2707                 /*
2708                  * We don't want to put the private key password in eap.conf, so  check
2709                  * for our special string which indicates we should get the password
2710                  * programmatically.
2711                  */
2712                 char const* special_string = "Apple:UseCertAdmin";
2713                 if (strncmp(conf->private_key_password, special_string, strlen(special_string)) == 0) {
2714                         char cmd[256];
2715                         char *password;
2716                         long const max_password_len = 128;
2717                         snprintf(cmd, sizeof(cmd) - 1, "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
2718                                  conf->private_key_file);
2719
2720                         DEBUG2(LOG_PREFIX ":  Getting private key passphrase using command \"%s\"", cmd);
2721
2722                         FILE* cmd_pipe = popen(cmd, "r");
2723                         if (!cmd_pipe) {
2724                                 ERROR(LOG_PREFIX ": %s command failed: Unable to get private_key_password", cmd);
2725                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2726                                 return NULL;
2727                         }
2728
2729                         rad_const_free(conf->private_key_password);
2730                         password = talloc_array(conf, char, max_password_len);
2731                         if (!password) {
2732                                 ERROR(LOG_PREFIX ": Can't allocate space for private_key_password");
2733                                 ERROR(LOG_PREFIX ": Error reading private_key_file %s", conf->private_key_file);
2734                                 pclose(cmd_pipe);
2735                                 return NULL;
2736                         }
2737
2738                         fgets(password, max_password_len, cmd_pipe);
2739                         pclose(cmd_pipe);
2740
2741                         /* Get rid of newline at end of password. */
2742                         password[strlen(password) - 1] = '\0';
2743
2744                         DEBUG3(LOG_PREFIX ": Password from command = \"%s\"", password);
2745                         conf->private_key_password = password;
2746                 }
2747 #endif
2748
2749                 {
2750                         char *password;
2751
2752                         memcpy(&password, &conf->private_key_password, sizeof(password));
2753                         SSL_CTX_set_default_passwd_cb_userdata(ctx, password);
2754                         SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
2755                 }
2756         }
2757
2758 #ifdef PSK_MAX_IDENTITY_LEN
2759         if (!client) {
2760                 /*
2761                  *      No dynamic query exists.  There MUST be a
2762                  *      statically configured identity and password.
2763                  */
2764                 if (conf->psk_query && !*conf->psk_query) {
2765                         ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be empty");
2766                         return NULL;
2767                 }
2768
2769                 /*
2770                  *      Set the callback only if we can check things.
2771                  */
2772                 if (conf->psk_identity || conf->psk_query) {
2773                         SSL_CTX_set_psk_server_callback(ctx, psk_server_callback);
2774                 }
2775
2776         } else if (conf->psk_query) {
2777                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_query cannot be used for outgoing connections");
2778                 return NULL;
2779         }
2780
2781         /*
2782          *      Now check that if PSK is being used, the config is valid.
2783          */
2784         if ((conf->psk_identity && !conf->psk_password) ||
2785             (!conf->psk_identity && conf->psk_password) ||
2786             (conf->psk_identity && !*conf->psk_identity) ||
2787             (conf->psk_password && !*conf->psk_password)) {
2788                 ERROR(LOG_PREFIX ": Invalid PSK Configuration: psk_identity or psk_password are empty");
2789                 return NULL;
2790         }
2791
2792         if (conf->psk_identity) {
2793                 size_t psk_len, hex_len;
2794                 uint8_t buffer[PSK_MAX_PSK_LEN];
2795
2796                 if (conf->certificate_file ||
2797                     conf->private_key_password || conf->private_key_file ||
2798                     conf->ca_file || conf->ca_path) {
2799                         ERROR(LOG_PREFIX ": When PSKs are used, No certificate configuration is permitted");
2800                         return NULL;
2801                 }
2802
2803                 if (client) {
2804                         SSL_CTX_set_psk_client_callback(ctx,
2805                                                         psk_client_callback);
2806                 }
2807
2808                 psk_len = strlen(conf->psk_password);
2809                 if (strlen(conf->psk_password) > (2 * PSK_MAX_PSK_LEN)) {
2810                         ERROR(LOG_PREFIX ": psk_hexphrase is too long (max %d)", PSK_MAX_PSK_LEN);
2811                         return NULL;
2812                 }
2813
2814                 /*
2815                  *      Check the password now, so that we don't have
2816                  *      errors at run-time.
2817                  */
2818                 hex_len = fr_hex2bin(buffer, sizeof(buffer), conf->psk_password, psk_len);
2819                 if (psk_len != (2 * hex_len)) {
2820                         ERROR(LOG_PREFIX ": psk_hexphrase is not all hex");
2821                         return NULL;
2822                 }
2823
2824                 goto post_ca;
2825         }
2826 #else
2827         (void) client;  /* -Wunused */
2828 #endif
2829
2830         /*
2831          *      Load our keys and certificates
2832          *
2833          *      If certificates are of type PEM then we can make use
2834          *      of cert chain authentication using openssl api call
2835          *      SSL_CTX_use_certificate_chain_file.  Please see how
2836          *      the cert chain needs to be given in PEM from
2837          *      openSSL.org
2838          */
2839         if (!conf->certificate_file) goto load_ca;
2840
2841         if (type == SSL_FILETYPE_PEM) {
2842                 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
2843                         tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2844                                       conf->certificate_file);
2845                         return NULL;
2846                 }
2847
2848         } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
2849                 tls_error_log(NULL, "Failed reading certificate file \"%s\"",
2850                               conf->certificate_file);
2851                 return NULL;
2852         }
2853
2854         /* Load the CAs we trust */
2855 load_ca:
2856         if (conf->ca_file || conf->ca_path) {
2857                 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
2858                         tls_error_log(NULL, "Failed reading Trusted root CA list \"%s\"",
2859                                       conf->ca_file);
2860                         return NULL;
2861                 }
2862         }
2863         if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
2864
2865         if (conf->private_key_file) {
2866                 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
2867                         tls_error_log(NULL, "Failed reading private key file \"%s\"",
2868                                       conf->private_key_file);
2869                         return NULL;
2870                 }
2871
2872                 /*
2873                  * Check if the loaded private key is the right one
2874                  */
2875                 if (!SSL_CTX_check_private_key(ctx)) {
2876                         ERROR(LOG_PREFIX ": Private key does not match the certificate public key");
2877                         return NULL;
2878                 }
2879         }
2880
2881 #ifdef PSK_MAX_IDENTITY_LEN
2882 post_ca:
2883 #endif
2884
2885         /*
2886          *      We never want SSLv2 or SSLv3.
2887          */
2888         ctx_options |= SSL_OP_NO_SSLv2;
2889         ctx_options |= SSL_OP_NO_SSLv3;
2890
2891         /*
2892          *      As of 3.0.5, we always allow TLSv1.1 and TLSv1.2.
2893          *      Though they can be *globally* disabled if necessary.x
2894          */
2895 #ifdef SSL_OP_NO_TLSv1
2896         if (conf->disable_tlsv1) ctx_options |= SSL_OP_NO_TLSv1;
2897
2898         ctx_tls_versions |= SSL_OP_NO_TLSv1;
2899 #endif
2900 #ifdef SSL_OP_NO_TLSv1_1
2901         if (conf->disable_tlsv1_1) ctx_options |= SSL_OP_NO_TLSv1_1;
2902
2903         ctx_tls_versions |= SSL_OP_NO_TLSv1_1;
2904 #endif
2905 #ifdef SSL_OP_NO_TLSv1_2
2906
2907         if (conf->disable_tlsv1_2) ctx_options |= SSL_OP_NO_TLSv1_2;
2908
2909         ctx_tls_versions |= SSL_OP_NO_TLSv1_2;
2910
2911 #endif
2912
2913         if ((ctx_options & ctx_tls_versions) == ctx_tls_versions) {
2914                 ERROR(LOG_PREFIX ": You have disabled all available TLS versions.  EAP will not work");
2915                 return NULL;
2916         }
2917
2918 #ifdef SSL_OP_NO_TICKET
2919         ctx_options |= SSL_OP_NO_TICKET;
2920 #endif
2921
2922         if (!conf->disable_single_dh_use) {
2923                 /*
2924                  *      SSL_OP_SINGLE_DH_USE must be used in order to prevent
2925                  *      small subgroup attacks and forward secrecy. Always
2926                  *      using SSL_OP_SINGLE_DH_USE has an impact on the
2927                  *      computer time needed during negotiation, but it is not
2928                  *      very large.
2929                  */
2930                 ctx_options |= SSL_OP_SINGLE_DH_USE;
2931         }
2932
2933         /*
2934          *      SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
2935          *      in Windows Vista client.
2936          *      http://www.openssl.org/~bodo/tls-cbc.txt
2937          *      http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
2938          */
2939         ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
2940
2941         if (conf->cipher_server_preference) {
2942                 /*
2943                  *      SSL_OP_CIPHER_SERVER_PREFERENCE to follow best practice
2944                  *      of nowday's TLS: do not allow poorly-selected ciphers from
2945                  *      client to take preference
2946                  */
2947                 ctx_options |= SSL_OP_CIPHER_SERVER_PREFERENCE;
2948         }
2949
2950         SSL_CTX_set_options(ctx, ctx_options);
2951
2952         /*
2953          *      TODO: Set the RSA & DH
2954          *      SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
2955          *      SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
2956          */
2957
2958         /*
2959          *      set the message callback to identify the type of
2960          *      message.  For every new session, there can be a
2961          *      different callback argument.
2962          *
2963          *      SSL_CTX_set_msg_callback(ctx, cbtls_msg);
2964          */
2965
2966         /*
2967          *      Set eliptical curve crypto configuration.
2968          */
2969 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
2970 #ifndef OPENSSL_NO_ECDH
2971         if (set_ecdh_curve(ctx, conf->ecdh_curve, conf->disable_single_dh_use) < 0) {
2972                 return NULL;
2973         }
2974 #endif
2975 #endif
2976
2977         /*
2978          *      OpenSSL will automatically create certificate chains,
2979          *      unless we tell it to not do that.  The problem is that
2980          *      it sometimes gets the chains right from a certificate
2981          *      signature view, but wrong from the clients view.
2982          */
2983         if (!conf->auto_chain) {
2984                 SSL_CTX_set_mode(ctx, SSL_MODE_NO_AUTO_CHAIN);
2985         }
2986
2987         /* Set Info callback */
2988         SSL_CTX_set_info_callback(ctx, cbtls_info);
2989
2990         /*
2991          *      Callbacks, etc. for session resumption.
2992          */
2993         if (conf->session_cache_enable) {
2994                 /*
2995                  *      Cache sessions on disk if requested.
2996                  */
2997                 if (conf->session_cache_path) {
2998                         SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
2999                         SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
3000                         SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
3001                 }
3002
3003                 SSL_CTX_set_quiet_shutdown(ctx, 1);
3004                 if (fr_tls_ex_index_vps < 0)
3005                         fr_tls_ex_index_vps = SSL_SESSION_get_ex_new_index(0, NULL, NULL, NULL, sess_free_vps);
3006         }
3007
3008         /*
3009          *      Check the certificates for revocation.
3010          */
3011 #ifdef X509_V_FLAG_CRL_CHECK
3012         if (conf->check_crl) {
3013                 certstore = SSL_CTX_get_cert_store(ctx);
3014                 if (certstore == NULL) {
3015                         tls_error_log(NULL, "Error reading Certificate Store");
3016                         return NULL;
3017                 }
3018                 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
3019
3020 #ifdef X509_V_FLAG_CRL_CHECK_ALL
3021                 if (conf->check_all_crl)
3022                         X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK_ALL);
3023 #endif
3024         }
3025 #endif
3026
3027         /*
3028          *      Set verify modes
3029          *      Always verify the peer certificate
3030          */
3031         verify_mode |= SSL_VERIFY_PEER;
3032         verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
3033         verify_mode |= SSL_VERIFY_CLIENT_ONCE;
3034         SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
3035
3036         if (conf->verify_depth) {
3037                 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
3038         }
3039
3040         /* Load randomness */
3041         if (conf->random_file) {
3042                 if (!(RAND_load_file(conf->random_file, 1024*10))) {
3043                         tls_error_log(NULL, "Failed loading randomness");
3044                         return NULL;
3045                 }
3046         }
3047
3048         /*
3049          * Set the cipher list if we were told to
3050          */
3051         if (conf->cipher_list) {
3052                 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
3053                         tls_error_log(NULL, "Failed setting cipher list");
3054                         return NULL;
3055                 }
3056         }
3057
3058         /*
3059          *      Setup session caching
3060          */
3061         if (conf->session_cache_enable) {
3062                 /*
3063                  *      Create a unique context Id per EAP-TLS configuration.
3064                  */
3065                 if (conf->session_id_name) {
3066                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
3067                                  "FR eap %s", conf->session_id_name);
3068                 } else {
3069                         snprintf(conf->session_context_id, sizeof(conf->session_context_id),
3070                                  "FR eap %p", conf);
3071                 }
3072
3073                 /*
3074                  *      Cache it, DON'T auto-clear it, and disable the internal OpenSSL session cache.
3075                  */
3076                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR | SSL_SESS_CACHE_NO_INTERNAL);
3077
3078                 SSL_CTX_set_session_id_context(ctx,
3079                                                (unsigned char *) conf->session_context_id,
3080                                                (unsigned int) strlen(conf->session_context_id));
3081
3082                 /*
3083                  *      Our timeout is in hours, this is in seconds.
3084                  */
3085                 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
3086
3087                 /*
3088                  *      Set the maximum number of entries in the
3089                  *      session cache.
3090                  */
3091                 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
3092
3093         } else {
3094                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
3095         }
3096
3097         return ctx;
3098 }
3099
3100
3101 /*
3102  *      Free TLS client/server config
3103  *      Should not be called outside this code, as a callback is
3104  *      added to automatically free the data when the CONF_SECTION
3105  *      is freed.
3106  */
3107 static int _tls_server_conf_free(fr_tls_server_conf_t *conf)
3108 {
3109         if (conf->ctx) SSL_CTX_free(conf->ctx);
3110
3111 #ifdef HAVE_OPENSSL_OCSP_H
3112         if (conf->ocsp_store) X509_STORE_free(conf->ocsp_store);
3113         conf->ocsp_store = NULL;
3114 #endif
3115
3116 #ifndef NDEBUG
3117         memset(conf, 0, sizeof(*conf));
3118 #endif
3119         return 0;
3120 }
3121
3122 fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx)
3123 {
3124         fr_tls_server_conf_t *conf;
3125
3126         conf = talloc_zero(ctx, fr_tls_server_conf_t);
3127         if (!conf) {
3128                 ERROR(LOG_PREFIX ": Out of memory");
3129                 return NULL;
3130         }
3131
3132         talloc_set_destructor(conf, _tls_server_conf_free);
3133
3134         return conf;
3135 }
3136
3137 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs)
3138 {
3139         fr_tls_server_conf_t *conf;
3140
3141         /*
3142          *      If cs has already been parsed there should be a cached copy
3143          *      of conf already stored, so just return that.
3144          */
3145         conf = cf_data_find(cs, "tls-conf");
3146         if (conf) {
3147                 DEBUG(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3148                 return conf;
3149         }
3150
3151         conf = tls_server_conf_alloc(cs);
3152
3153         if (cf_section_parse(cs, conf, tls_server_config) < 0) {
3154         error:
3155                 talloc_free(conf);
3156                 return NULL;
3157         }
3158
3159         /*
3160          *      Save people from their own stupidity.
3161          */
3162         if (conf->fragment_size < 100) conf->fragment_size = 100;
3163
3164         /*
3165          *      Only check for certificate things if we don't have a
3166          *      PSK query.
3167          */
3168         if (conf->psk_identity) {
3169                 if (conf->private_key_file) {
3170                         WARN(LOG_PREFIX ": Ignoring private key file due to psk_identity being used");
3171                 }
3172
3173                 if (conf->certificate_file) {
3174                         WARN(LOG_PREFIX ": Ignoring certificate file due to psk_identity being used");
3175                 }
3176
3177         } else {
3178                 if (!conf->private_key_file) {
3179                         ERROR(LOG_PREFIX ": TLS Server requires a private key file");
3180                         goto error;
3181                 }
3182
3183                 if (!conf->certificate_file) {
3184                         ERROR(LOG_PREFIX ": TLS Server requires a certificate file");
3185                         goto error;
3186                 }
3187         }
3188
3189         /*
3190          *      Initialize TLS
3191          */
3192         conf->ctx = tls_init_ctx(conf, 0);
3193         if (conf->ctx == NULL) {
3194                 goto error;
3195         }
3196
3197 #ifdef HAVE_OPENSSL_OCSP_H
3198         /*
3199          *      Initialize OCSP Revocation Store
3200          */
3201         if (conf->ocsp_enable) {
3202                 conf->ocsp_store = init_revocation_store(conf);
3203                 if (conf->ocsp_store == NULL) goto error;
3204         }
3205 #endif /*HAVE_OPENSSL_OCSP_H*/
3206         {
3207                 char *dh_file;
3208
3209                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3210                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3211                         goto error;
3212                 }
3213         }
3214
3215         if (conf->verify_tmp_dir) {
3216                 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
3217                         ERROR(LOG_PREFIX ": Failed changing permissions on %s: %s",
3218                               conf->verify_tmp_dir, fr_syserror(errno));
3219                         goto error;
3220                 }
3221         }
3222
3223         if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
3224                 ERROR(LOG_PREFIX ": You MUST set the verify directory in order to use verify_client_cmd");
3225                 goto error;
3226         }
3227
3228 #ifdef SSL_OP_NO_TLSv1_2
3229         /*
3230          *      OpenSSL 1.0.1f and 1.0.1g get the MS-MPPE keys wrong.
3231          */
3232 #if (OPENSSL_VERSION_NUMBER >= 0x10010060L) && (OPENSSL_VERSION_NUMBER < 0x10010060L)
3233         conf->disable_tlsv1_2 = true;
3234         WARN(LOG_PREFIX ": Disabling TLSv1.2 due to OpenSSL bugs");
3235 #endif
3236 #endif
3237
3238         /*
3239          *      Cache conf in cs in case we're asked to parse this again.
3240          */
3241         cf_data_add(cs, "tls-conf", conf, NULL);
3242
3243         return conf;
3244 }
3245
3246 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs)
3247 {
3248         fr_tls_server_conf_t *conf;
3249
3250         conf = cf_data_find(cs, "tls-conf");
3251         if (conf) {
3252                 DEBUG2(LOG_PREFIX ": Using cached TLS configuration from previous invocation");
3253                 return conf;
3254         }
3255
3256         conf = tls_server_conf_alloc(cs);
3257
3258         if (cf_section_parse(cs, conf, tls_client_config) < 0) {
3259         error:
3260                 talloc_free(conf);
3261                 return NULL;
3262         }
3263
3264         /*
3265          *      Save people from their own stupidity.
3266          */
3267         if (conf->fragment_size < 100) conf->fragment_size = 100;
3268
3269         /*
3270          *      Initialize TLS
3271          */
3272         conf->ctx = tls_init_ctx(conf, 1);
3273         if (conf->ctx == NULL) {
3274                 goto error;
3275         }
3276
3277         {
3278                 char *dh_file;
3279
3280                 memcpy(&dh_file, &conf->dh_file, sizeof(dh_file));
3281                 if (load_dh_params(conf->ctx, dh_file) < 0) {
3282                         goto error;
3283                 }
3284         }
3285
3286         cf_data_add(cs, "tls-conf", conf, NULL);
3287
3288         return conf;
3289 }
3290
3291
3292 int tls_success(tls_session_t *ssn, REQUEST *request)
3293 {
3294         VALUE_PAIR *vp, *vps = NULL;
3295         fr_tls_server_conf_t *conf;
3296         TALLOC_CTX *talloc_ctx;
3297
3298         conf = (fr_tls_server_conf_t *)SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_CONF);
3299         rad_assert(conf != NULL);
3300
3301         talloc_ctx = SSL_get_ex_data(ssn->ssl, FR_TLS_EX_INDEX_TALLOC);
3302
3303         /*
3304          *      If there's no session resumption, delete the entry
3305          *      from the cache.  This means either it's disabled
3306          *      globally for this SSL context, OR we were told to
3307          *      disable it for this user.
3308          *
3309          *      This also means you can't turn it on just for one
3310          *      user.
3311          */
3312         if ((!ssn->allow_session_resumption) ||
3313             (((vp = fr_pair_find_by_num(request->config, PW_ALLOW_SESSION_RESUMPTION, 0, TAG_ANY)) != NULL) &&
3314              (vp->vp_integer == 0))) {
3315                 SSL_CTX_remove_session(ssn->ctx,
3316                                        ssn->ssl_session);
3317                 ssn->allow_session_resumption = false;
3318
3319                 /*
3320                  *      If we're in a resumed session and it's
3321                  *      not allowed,
3322                  */
3323                 if (SSL_session_reused(ssn->ssl)) {
3324                         RDEBUG("Forcibly stopping session resumption as it is not allowed");
3325                         return -1;
3326                 }
3327
3328         /*
3329          *      Else resumption IS allowed, so we store the
3330          *      user data in the cache.
3331          */
3332         } else if (!SSL_session_reused(ssn->ssl)) {
3333                 VALUE_PAIR **certs;
3334                 char buffer[2 * MAX_SESSION_SIZE + 1];
3335
3336                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3337
3338                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_USER_NAME, 0, TAG_ANY);
3339                 if (vp) fr_pair_add(&vps, vp);
3340
3341                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY);
3342                 if (vp) fr_pair_add(&vps, vp);
3343
3344                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->packet->vps, PW_STRIPPED_USER_DOMAIN, 0, TAG_ANY);
3345                 if (vp) fr_pair_add(&vps, vp);
3346
3347                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CHARGEABLE_USER_IDENTITY, 0, TAG_ANY);
3348                 if (vp) fr_pair_add(&vps, vp);
3349
3350                 vp = fr_pair_list_copy_by_num(talloc_ctx, request->reply->vps, PW_CACHED_SESSION_POLICY, 0, TAG_ANY);
3351                 if (vp) fr_pair_add(&vps, vp);
3352
3353                 certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3354
3355                 /*
3356                  *      Hmm... the certs should probably be session data.
3357                  */
3358                 if (certs) {
3359                         /*
3360                          *      @todo: some go into reply, others into
3361                          *      request
3362                          */
3363                         fr_pair_add(&vps, fr_pair_list_copy(talloc_ctx, *certs));
3364
3365                         /*
3366                          *      Save the certs in the packet, so that we can see them.
3367                          */
3368                         fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3369
3370                         vp = fr_pair_find_by_num(request->packet->vps, PW_TLS_CLIENT_CERT_EXPIRATION, 0, TAG_ANY);
3371                         if (vp) {
3372                                 time_t expires;
3373
3374                                 if (ocsp_asn1time_to_epoch(&expires, vp->vp_strvalue) < 0) {
3375                                         RDEBUG2("Failed getting certificate expiration, removing cache entry for session %s", buffer);
3376                                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3377                                         return -1;
3378                                 }
3379
3380                                 if (expires <= request->timestamp) {
3381                                         RDEBUG2("Certificate has expired, removing cache entry for session %s", buffer);
3382                                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3383                                         return -1;
3384                                 }
3385
3386                                 /*
3387                                  *      Account for Session-Timeout, if it's available.
3388                                  */
3389                                 vp = fr_pair_find_by_num(request->reply->vps, PW_SESSION_TIMEOUT, 0, TAG_ANY);
3390                                 if (vp) {
3391                                         if ((request->timestamp + vp->vp_integer) > expires) {
3392                                                 vp->vp_integer = expires - request->timestamp;
3393                                                 RWDEBUG2("Updating Session-Timeout to %u, due to impending certificate expiration",
3394                                                          vp->vp_integer);
3395                                         }
3396                                 }
3397                         }
3398                 }
3399
3400                 if (vps) {
3401                         SSL_SESSION_set_ex_data(ssn->ssl_session, fr_tls_ex_index_vps, vps);
3402                         rdebug_pair_list(L_DBG_LVL_2, request, vps, "  caching ");
3403
3404                         if (conf->session_cache_path) {
3405                                 /* write the VPs to the cache file */
3406                                 char filename[256], buf[1024];
3407                                 FILE *vp_file;
3408
3409                                 RDEBUG2("Saving session %s in the disk cache", buffer);
3410
3411                                 snprintf(filename, sizeof(filename), "%s%c%s.vps", conf->session_cache_path,
3412                                          FR_DIR_SEP, buffer);
3413                                 vp_file = fopen(filename, "w");
3414                                 if (vp_file == NULL) {
3415                                         RWDEBUG("Could not write session VPs to persistent cache: %s",
3416                                                 fr_syserror(errno));
3417                                 } else {
3418                                         VALUE_PAIR *prev = NULL;
3419                                         vp_cursor_t cursor;
3420                                         /* generate a dummy user-style entry which is easy to read back */
3421                                         fprintf(vp_file, "# SSL cached session\n");
3422                                         fprintf(vp_file, "%s\n\t", buffer);
3423
3424                                         for (vp = fr_cursor_init(&cursor, &vps);
3425                                              vp;
3426                                              vp = fr_cursor_next(&cursor)) {
3427                                                 /*
3428                                                  *      Terminate the previous line.
3429                                                  */
3430                                                 if (prev) fprintf(vp_file, ",\n\t");
3431
3432                                                 /*
3433                                                  *      Write this one.
3434                                                  */
3435                                                 vp_prints(buf, sizeof(buf), vp);
3436                                                 fputs(buf, vp_file);
3437                                                 prev = vp;
3438                                         }
3439
3440                                         /*
3441                                          *      Terminate the final line.
3442                                          */
3443                                         fprintf(vp_file, "\n");
3444                                         fclose(vp_file);
3445                                 }
3446                         } else {
3447                                 RDEBUG("Failed to find 'persist_dir' in TLS configuration.  Session will not be cached on disk.");
3448                         }
3449                 } else {
3450                         RDEBUG2("No information to cache: session caching will be disabled for session %s", buffer);
3451                         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3452                 }
3453
3454         /*
3455          *      Else the session WAS allowed.  Copy the cached reply.
3456          */
3457         } else {
3458                 char buffer[2 * MAX_SESSION_SIZE + 1];
3459
3460                 tls_session_id(ssn->ssl_session, buffer, MAX_SESSION_SIZE);
3461
3462                 /*
3463                  *      The "restore VPs from OpenSSL cache" code is
3464                  *      now in eaptls_process()
3465                  */
3466
3467                 if (conf->session_cache_path) {
3468                         /* "touch" the cached session/vp file */
3469                         char filename[256];
3470
3471                         snprintf(filename, sizeof(filename), "%s%c%s.asn1",
3472                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3473                         utime(filename, NULL);
3474                         snprintf(filename, sizeof(filename), "%s%c%s.vps",
3475                                  conf->session_cache_path, FR_DIR_SEP, buffer);
3476                         utime(filename, NULL);
3477                 }
3478
3479                 /*
3480                  *      Mark the request as resumed.
3481                  */
3482                 pair_make_request("EAP-Session-Resumed", "1", T_OP_SET);
3483         }
3484
3485         return 0;
3486 }
3487
3488
3489 void tls_fail(tls_session_t *ssn)
3490 {
3491         /*
3492          *      Force the session to NOT be cached.
3493          */
3494         SSL_CTX_remove_session(ssn->ctx, ssn->ssl_session);
3495 }
3496
3497 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request)
3498
3499 {
3500         int err;
3501         VALUE_PAIR **certs;
3502
3503         /*
3504          *      Decrypt the complete record.
3505          */
3506         err = BIO_write(ssn->into_ssl, ssn->dirty_in.data,
3507                         ssn->dirty_in.used);
3508         if (err != (int) ssn->dirty_in.used) {
3509                 record_init(&ssn->dirty_in);
3510                 RDEBUG("Failed writing %zd bytes to SSL BIO: %d", ssn->dirty_in.used, err);
3511                 return FR_TLS_FAIL;
3512         }
3513
3514         /*
3515          *      Clear the dirty buffer now that we are done with it
3516          *      and init the clean_out buffer to store decrypted data
3517          */
3518         record_init(&ssn->dirty_in);
3519         record_init(&ssn->clean_out);
3520
3521         /*
3522          *      Read (and decrypt) the tunneled data from the
3523          *      SSL session, and put it into the decrypted
3524          *      data buffer.
3525          */
3526         err = SSL_read(ssn->ssl, ssn->clean_out.data, sizeof(ssn->clean_out.data));
3527         if (err < 0) {
3528                 int code;
3529
3530                 RDEBUG("SSL_read Error");
3531
3532                 code = SSL_get_error(ssn->ssl, err);
3533                 switch (code) {
3534                 case SSL_ERROR_WANT_READ:
3535                         DEBUG("Error in fragmentation logic: SSL_WANT_READ");
3536                         return FR_TLS_MORE_FRAGMENTS;
3537
3538                 case SSL_ERROR_WANT_WRITE:
3539                         DEBUG("Error in fragmentation logic: SSL_WANT_WRITE");
3540                         break;
3541
3542                 default:
3543                         REDEBUG("Error in fragmentation logic");
3544                         tls_error_io_log(request, ssn, err,
3545                                          "Failed in " STRINGIFY(__FUNCTION__) " (SSL_read)");
3546                         break;
3547                 }
3548                 return FR_TLS_FAIL;
3549         }
3550
3551         if (err == 0) RWDEBUG("No data inside of the tunnel");
3552
3553         /*
3554          *      Passed all checks, successfully decrypted data
3555          */
3556         ssn->clean_out.used = err;
3557
3558         /*
3559          *      Add the certificates to intermediate packets, so that
3560          *      the inner tunnel policies can use them.
3561          */
3562         certs = (VALUE_PAIR **)SSL_get_ex_data(ssn->ssl, fr_tls_ex_index_certs);
3563
3564         if (certs) fr_pair_add(&request->packet->vps, fr_pair_list_copy(request->packet, *certs));
3565
3566         return FR_TLS_OK;
3567 }
3568
3569
3570 /*
3571  * Acknowledge received is for one of the following messages sent earlier
3572  * 1. Handshake completed Message, so now send, EAP-Success
3573  * 2. Alert Message, now send, EAP-Failure
3574  * 3. Fragment Message, now send, next Fragment
3575  */
3576 fr_tls_status_t tls_ack_handler(tls_session_t *ssn, REQUEST *request)
3577 {
3578         if (ssn == NULL){
3579                 REDEBUG("Unexpected ACK received:  No ongoing SSL session");
3580                 return FR_TLS_INVALID;
3581         }
3582         if (!ssn->info.initialized) {
3583                 RDEBUG("No SSL info available.  Waiting for more SSL data");
3584                 return FR_TLS_REQUEST;
3585         }
3586
3587         if ((ssn->info.content_type == handshake) && (ssn->info.origin == 0)) {
3588                 REDEBUG("Unexpected ACK received:  We sent no previous messages");
3589                 return FR_TLS_INVALID;
3590         }
3591
3592         switch (ssn->info.content_type) {
3593         case alert:
3594                 RDEBUG2("Peer ACKed our alert");
3595                 return FR_TLS_FAIL;
3596
3597         case handshake:
3598                 if ((ssn->info.handshake_type == handshake_finished) && (ssn->dirty_out.used == 0)) {
3599                         RDEBUG2("Peer ACKed our handshake fragment.  handshake is finished");
3600
3601                         /*
3602                          *      From now on all the content is
3603                          *      application data set it here as nobody else
3604                          *      sets it.
3605                          */
3606                         ssn->info.content_type = application_data;
3607                         return FR_TLS_SUCCESS;
3608                 } /* else more data to send */
3609
3610                 RDEBUG2("Peer ACKed our handshake fragment");
3611                 /* Fragmentation handler, send next fragment */
3612                 return FR_TLS_REQUEST;
3613
3614         case application_data:
3615                 RDEBUG2("Peer ACKed our application data fragment");
3616                 return FR_TLS_REQUEST;
3617
3618                 /*
3619                  *      For the rest of the conditions, switch over
3620                  *      to the default section below.
3621                  */
3622         default:
3623                 REDEBUG("Invalid ACK received: %d", ssn->info.content_type);
3624                 return FR_TLS_INVALID;
3625         }
3626 }
3627 #endif  /* WITH_TLS */
3628